General Organic Chemistry (GOC)

General Organic Chemistry (GOC) Fundamental Concepts of Organic Chemistry 1. Which of the following alkanes has neither secondary nor tertiary hydrogen? A. iso-Butane B. iso-Pentane C. Pentane D. neo-Pentane Answer. D 2. How many cyclic isomers is possible for C6H12? A. 3 B. 2 C. 4 D. 5 Answer. D 3. Which of the following Group is used as Anti Freeze in Motor Radiator? A. Alcohol B. Ketone C. Alkane D. Alkyne Answer. 4. An A. B. C. D.

electrophile is a/an Lewis base Lewis acid electron deficient species Both A and B

Answer. B 5.

Geometrical isomerism exist due to the presence of A. single bond between C and C B. double bond between C and C C. triple bond between C and C D. All the above Answer. B

6. In the case of o-chlorophenol there exist A. intramolecular hydrogen bonding B. intermolecular covalent bonding C. no hydrogen bonding D. both inter and intramolecular hydrogen bonding

Answer. A 7. In isopentane the number of secondary carbon atom is A. 1 B. 2 C. 3 D. 0 Answer. A 8. Carbocation (carbonium ion) is A. a set of carbon atoms B. an electrophile C. a free radical D. a nucleophile Answer. B 9. Carbonium ions contain only ___electrons around the carbon core. A. 2 B. 6 C. 5 D. 9 Answer. B 10.Carboxylic acids are isomeric with A. Amines B. Esters C. Aldehydes D. acid anhydrides Answer. B 11.Two or more compounds having the same number and kind of atoms and same molecular weight are called A. Isobars B. Isotones C. Isomers D. Isochors Answer. C 12.The process of separating a racemic mixture into optical isomers is known as A. Dissolution B. Isomerisation C. Resolution D. Pasteurization Answer. C 13.Sulphur trioxide is A. a Lewis base

B. a base C. nucleophile D. an electrophile Answer. D 14.In neopentane the number of primary carbon atoms are A. 4 B. 5 C. 2 D. 1 Answer. A 15.Which of the following type of isomerism is found in the members of the same homologous series? A. Functional isomerism B. Position isomerism C. Metamerism D. None of these Answer. C 16.Hetrolytic fission results in the formation of A. Electrophile B. free radicals C. electrophile and nucleophile D. electrons Answer. C 17.In acetylene C-C-H bond angle is A. 144 degree B. 180 degree C. 90 degree D. 96 degree Answer. B 18.The forces between the molecules of a non-polar compounds are A. Van der Walls forces B. ionic bonding C. hybrid forces D. dipole forces Answer. A

19.Carbanions are isoelectronic with A. ethers B. alcohols C. amines

D. carboxylic acids Answer. C 20.Diethyl amine and methylk propylamines are A. metamers B. tautomers C. dynamic isomers D. optical isomers Answer. A 21.The number of possible metamers of pentonone are A. 5 B. 1 C. 3 D. 6 Answer. C 22.The tetrahedral nature of the carbon was given by A. Vant Hof B. Lewis C. Le Bell and Vant Hof D. None of the above Answer. C 23.Decomposition of a compound by the action of heat is known as A. decomposition B. knocking C. smelting D. pyrolysis Answer. D 24.The most volatile amongst the following is A. p-nitrophenol B. m-nitrophenol C. o-nitrophenol D. none of these Answer. A

25.Diferent arrangement of atoms that can be converted into one another by rotation about single bonds are called A. trans-isomers B. conformation C. enantiomers D. None of these

Answer. B 26.A nucleophile is a A. Lewis base B. Lewis acid C. neither a Lewis acid nor a Lewis base D. both A & B Answer. A 27.Chain isomers difer w.r.t. A. position of substituent B. position of functional group C. chemical efect D. root word Answer. D 28.Alcohols are isomeric with A. ketones B. ethers C. amines D. acids Answer. B 29.The total no. of possible isomers of ethane are A. 10 B. 20 C. 4 D. Infinite Answer. D 30.Which of the following carbonium ions is the most stable? A. triphenyl methyl B. diphenyl methyl C. benzyl D. All the above Answer. A

31.Liquids whose molecules are held together by hydrogen bonds are called A. associated liquids B. aprotonic solvents C. primary liquid D. hydrated liquids Answer. A

32.In substitution reactions of tertiary halide, the ionisation of halogen atom as negative ion is facilitated by A. electron attracting group B. electron repelling group C. free radical D. All the above Answer. B 33.Which of the following represents the iso-butyl radical? A. Ethane B. Methane C. Ethyne D. Benzene Answer. D 34.Which of the following has zero dipole moment? A. 1-Butene B. cis-2-Butene C. trans-2-Butene D. 2-Methyl-1-propene Answer. C 35.Which of the following alkanes has neither secondary nor tertiary hydrogen? A. iso-Butane B. iso-Pentane C. Pentane D. neo-Pentane Answer. D 36.The no. of possible isomers of 1, 2-dichloroethane are A. 2 B. 3 C. 4 D. Infinite Answer. A

37.The IUPAC name of isoprene is A. 1, 3-Butadiene B. 2-Methyl-1, 3-butadiene C. 2-Methyl-1-butene D. 3-Methyl-1-butene Answer. B Isoprene

38.Which of the following compounds is chiral? A. 2-chloro-2-methyl butane B. 3-chloro hexane C. 2-chloro pentane D. 1-chloro pentane Answer. C 39.Which of the following compounds contains maximum number of tertiary hydrogen atoms? A. n-Hexane B. 2-2-Dimethyl butane C. 2, 3-Dimethyl butane D. 2-Methyl pentane Answer. C 40.The IUPAC name of crotyl chloride is A. 1-Chloro-1-butene B. 1-Chloro-2-butene C. 2-Chloro-2-butene D. 3-Chloro-1-butene Answer. B 41.The secondary suffix in the IUPAC names of ketones is A. -al B. -one C. -ol D. –oate Answer. B 42.Which of the following is optically active? A. isobutyl alcohol B. sec butyl alcohol C. tert butyl alcohol D. p-butyl alcohol Answer. B 43.IUPAC name of propargyl alcohol is A. Prop-2-yn-1-ol B. Prop-2-en-1-ol C. Prop-1-en-2-ol D. Prop-1-yn-2-ol Answer. A

44.The number of pi bonds in isoprene is A. 2 B. 3 C. 1 D. 0 Answer. A 45.Molecules that are not superimposable on their mirror images are A. Achiral B. Symmetric C. Asymmetric D. Chiral Answer. D 46.IUPAC name of propargyl alcohol is A. Prop-2-yn-1-ol B. Prop-2-en-1-ol C. Pro-1-en-2-ol D. Prop-1-yn-2-ol Answer. A 47.In iso-octane (2, 2, 4-trimethylpentane), the number of tertiary hydrogen atoms is A. One B. Two C. Three D. Four Answer. A 48.Paraffins is the common name used for A. Alkanes B. Alkenes C. Alkynes D. Arenes Answer. A

49.In iso-octane (2, 2-4-trimethylpentane), the number of primary hydrogen atoms is A. 12 B. 15 C. 13 D. 14 Answer. B

50.Which of the following molecules does not contains any secondary hydrogen atom? A. n-Pentane B. neo-Pentane C. neo-Hexane D. iso-Pentane Answer. B 51.Diastereomers are a pair A. stereoisomers that cannot be separated from each other B. stereoisomers that are not minor image of each other C. stereoisomers that have identical chemical properties D. stereoisomers that are minor image of each other Answer. B 52.Which of the following have zero dipole moment? A. 2 methyl propane B. trans-2-butene C. cis-2-butene D. butane-1 Answer. B 53.All A. B. C. D.

the members of a homologous series have same Molecular mass Molecular formula Empirical formula General molecular formula

Answer. C 54.The IUPAC name of allylene is A. Propyne B. Propene C. 2-Butyne D. 1-Butyne Answer. C

55.Which of the following is the functional isomer of methyl acetate? A. Ethyl acetate B. Propanoic acid C. Ethyl formate D. Propanone Answer. B

56.Which of the following compounds contains maximum number of tertiary hydrogen atoms? A. n-Hexane B. 2-2-Dimethylbutane C. 2, 3-Dimethylbytene D. 2-Metylpentane Answer. C 57.What is not true about homologous series? A. All the members have similar chemical properties B. They have identical physical properties C. They can be represented by a general formula D. Adjacent members difer in molecular mass by 14 Answer. B 58.Optical activity in a compound can be detected by means of A. Voltmeter B. Potentiometer C. Ammeter D. Polarimeter Answer. D 59.Which of the following compounds has least dipole moment? A. 1, 2-Dichlorobenzene B. 1, 3-Dichlorobenzene C. 1, 4-Dichlorobenzene D. All have same dipole moment Answer. C 60.An A. B. C. D.

example of conjugated diene is 1, 4-Pentadiene 1, 5-Hexadiene 1, 2-Butadiene 1, 3-Pentadiene

Answer. D

61.Number of sec-H atoms in iso-butane is A. 1 B. 9 C. 4 D. None Answer. D

62.Homolytic Fission is : A. Symmetrical B. Unsymmetrical C. Both D. None Answer. A 63.Alcohols are resistant to oxidation : A. Primary B. Secondary C. Tertiary D. All Answer. C 64.When alcohol is dehydrated ar 140 ͦC the produxt obtnd is : A. Ethane B. Diethyl ether C. Iodoform D. None Answer. B 65._____ are formed in homolytic bond fission : A. Free radicals B. Ions C. Both A & B D. None Answer. A 66.The factors which favor homolytic fission are : A. Electro negativity diference is less or zero B. Gaseous state C. Light & Electricity D. All of the above Answer. D

67.Unsymmetrical bond fission is favored in : A. Homolysis B. Heterolysis C. Both D. None Answer. B 68.Direction of polar reactions is from :

A. B. C. D.

Nucleophile to electrophile Electrophile to nucleophile Source to sink Both A & C

Answer. D 69.Which of the following is nucleophile : A. Cl – B. H2O C. NH3 D. All Answer. D 70.In tertiary Alcohols one C having OH group is attached to mainly how many more C : A. 1 B. 2 C. 3 D. 4 Answer. C 71.In combustion of methane the amount of energy released is : A. 891 kJ/mol B. 892 kJ/mol C. 893 kJ/mol D. None Answer. A 72.Which of the following is electrophile : A. Cl2 B. ClC. Br2 D. Both A & C Answer. D

73.Out of the following which reacts with alkanes in presence of ultra violet rays : A. Chlorine B. Bromine C. Iodine D. Flourine E. Both A & B F. Both C & D G. All

Answer. E 74.The step in which chlorine free radical reacts with methane and a methyl free radical is obtained is termed as : A. Initiation B. Propagation C. Termination D. None Answer. B 75.Combustion of alkanes is highly ____ so it requires ____ for initiation : A. Endothermic & nothing B. Exothermic & nothing C. Endothermic & flame D. Exothermic & spark Answer. D 76.Which of the following reaction is not synthetically important : A. Free radical reaction of alkanes B. Halogenation of alkanes C. Both A & B D. None Answer. C 77.During dehydrohalogenation of alkyl halides the hydrogen is removed from the C which is attached to : A. R B. X C. R or X D. None Answer. A

78.The catalysts used for dehydration of alcohol are : A. Al2O3 B. H2SO4 C. H3PO4 D. All Answer. D 79.The temperature required for primary alcohol to form ethene is : A. 150 ͦC

B. 180 ͦC C. 140-170 ͦC D. All of the above Answer. D 80.The catalytic hydrogenation of alkenes is at 1-5 atm pressure and giving 120kJ/mol per double bond and giving ______ compound : A. Unsaturated B. Saturated C. Depends upon given conditions D. None Answer. B 81.The catalysts used for catalytic hydrogenation of alkenes are : A. Pt,Pd,NiAl2O3 B. Pt, Pb, Raney Nickle C. Pt,Pd,Ni D. None Answer. C 82.For hydration of ethene the intermediate compound is : A. Methyl hydrogen sulphate B. Ethyl Hydrogen Sulphate C. Ethyl hydrogen Nitrate D. None Answer. B 83.For hydration of alkanes the optimum temperature is : A. 140 oC B. 100 oC C. 80 oC D. None Answer. B

84.As A. B. C. D.

the bromine reaches near the alkenes which becomes polarized : Alkene Bromine Molecule Both A & B None

Answer. B 85.1% dilute alkaline KMnO4 solution is a : A. Strong oxidizing agent B. Mild oxidizing agent

C. Weak oxidizing agent D. None Answer. B 86.Polymerization of ethane at 400 oC and 100 atm Pressure produces : A. Polyethane B. Polyethylene C. Polyethanol D. None Answer. B 87. Markovnikov's rule follow : A. Addition of unsynnetrical B. Addition of unsynnetrical C. Addition of unsynnetrical D. Addition of unsynnetrical

reagent to an unsymmetrical alkene alkene to an unsymmetrical alkene reagent to an unsymmetrical reagent alkene to an unsymmetrical alkane

Answer. C 88.Butene can have: A. Geometrical isomerism B. 2-position isomers C. Both A & B D. All structural isomers Answer. C 89.Geometrical isomerism is shown by : A. Alkanes B. Alkenes C. Alkynes D. Both A & C Answer. B

90.Anthracene has how many benzene rings? A. 2 B. 3 C. 4 D. 5 Answer. B 91.Pentane has how many isomers : A. 2 B. 3 C. 4 D. 5

Answer. B 92.Oxidation of alkenes in presence of hot KMnO4 solution the products obtained can be : A. Ketones B. Carboxylic acids C. Carbon dioxide D. All Answer. D 93.All A. B. C. D.

sp2 orbitals in benzene ring are : in diferent planes In same planes Coplanar Both B & C

Answer. D 94.Difused or delocalized electron cloud is formed by overlapping of : A. one 2py & one 2pz orbitals B. Both 2pz orbitals C. Any 2 orbitals D. None Answer. B 95.The stability of benzene ring is compared with : A. Cyclohexene B. 1,3 cyclohexadiene C. 1,3,6 cyclohexatriene D. None Answer. D

96. In A. B. C. D.

kekule’s structure the bond lengths between diferent carbons are as : Between C1-C4 Between C2-C5 Between C3-C6 None

Answer. D 97.During halogenation, nitration, Friedal craft’s reactions of benzene the direction of reaction is : A. Benzene ring to electrophile B. Electrophile to benzene ring C. Benzene ring to nucleophile D. Nucleophile to benzene ring

Answer. A 98.The acylation of benzene ring produces : A. Methy benzene B. Ethyl Benzene C. Acetophenone D. Alky Benzene Answer. C 99.Which of the followoing are electrophile : A. AlCl3 B. FeBr3 C. H2SO4 D. Both a & b E. All Answer. E 100.

The characteristic of SN2 reactions are : A. Change of hybridization from sp3 tetrahedral to sp2 planar B. Attack of weak leaving group C. Removal of Nucleophile D. Both a & c E. All Answer. D 101.

The order of SN2 reactions for primary alkyl halides is : A. 1 B. 2 C. 3 D. 4 Answer. B

102.

There is another site present on alkyl halides on which nucleophile can attack during B-Elimination reaactions : A. a-H B. b-H C. a-C D. b-C Answer. 42-The rate of E1 reactions depend upon : a)The concentration of substrate b)Conc. Of nucleophile c)Conc of substrate as well as nucleophile d)None 43-Which one of the following is not a nucleophile : a)H2O

b)H2S c)BF3 d)NH3 44-The benzene molecule contains : a)Three double bonds b)two double bonds c)One double bond d)Delocalized pi electron charge 45-During nitration of benzene active nitrating agent is : a)NO3 b)NO2+ c)NO2d)HNO3 46-Formula of chloroform is : a)CH3Cl b)CCl4 c)CH2Cl2 d)CHCl3 47-Optimum temperature for the fermentation is : a)25-35 oC b)35-45 oC c)15-25 oC d)None 48-The product obtained after re-Distilation of 95% alcohol in presence of CaO is called : a)rectified spirit b)Absolute alcohol c)Methyleted spirit d)None 49-For denaturation of alcohol which can be used : a)Methanol b)Ethanol c)Pyridine d)Acetone e)All f)All except ethanol 50-When NH3 reacts with alcohol then the catalyst used is : a)ZnCl2 b)ThO2 c)Pyridine d)None 51-Which reaction is correct :

a)2C2H5OH + 2Na ------> 2C2H5ONa + H2 b) 2C2H5OH + 2Na ------> 2C2H5ONa + H2O c) 2C2H5OH + 2Na ------> 2C2H5OONa + H2 d) 2C2H5OH + 2Na ------> 2C2H5ONaH + HO 52-Upon oxidation of 2-methyl 2 propanol the product obtained is : a)Ethanal b)Propanone c)2-Methylpropane d)None 53-When ethanol reacts with Phospho pentachloride then the products include : a)HCl b)HOCl c)H3PO3 d)None 54-The formulae for iodoform is : a)CHI3 b)CHBr3 c)CH2OHI d)None 55-The reason why phenol is more acidic is : a)Delocalization of electronic cloud of benzene ring b)Ka = 1.3 x 10^-10 c)delocaliztion of ?ve charge in ring d)Both b & c e)All 56-Phenol reacts with dilute HNO3 at 25oC to give : a)TNT b)Picric acid c)Both a & b d)None 57-Rectified spirit contains alcohol about : a)14% b)95% c)12% d)20% 58-Esterification of alcohols is___ with removal of water : a)Irreversible b)Reversible c)Maybe both d)None 59-CH3COCH2CH3 is ; a)2Propanone

b)Butanone c)Acetophenone d)None 60-The IUPAC name of (CH3)2 CH CH2 OH is : a)2,3methyl 2 propanol b) 2,4methyl 2 propanone c) 1,3ethyl 3 propanol d) 2,3methyl 1 propenol 61-In industry for preparation of formaldehyde the optimal conditions are : a)Pt-Asbestos b)300oC c)Both d)None 62-Acetaldehyde is prepared in the laboratory by the oxidation of ethyl alcohol with : a)Alkaline sodium dichromate solution b)Acidfied KMnO4 Solution b)Alkaline KMnO4 Solution d)None 63-Acidified aqueous hydrolysis of acetaldehyde cyanohydrin gives : a)2-Hydroxypropanoic acid b)Lactic acid c)alpha hydroxyl acid containing one C more than starting aldehyde or ketone d)All 64-Which one of the following is a good source of Cyanide ion : a)HCN b)KCN c)NH4CN d)LiCN 65-Tryosine has ____ taste : a)Sweet b)Sour c)Cheese d)None 66-Which of the following pair of amino acids have sec. amino group : a)Glycine & Proline b)Histidine & Glutamic acid c)Lysine & valine d)Proline & Histidine 67-The acidic character of amino acid is due to : a)COOH b)COOb)NH2

c)NH3+ 68-The catalyst used in the reaction of a-bromoacid with ammonia is : a)K b)P c)Li d)H 69-During strecker synthesis the intermediate compound obtained is : a)Ammonium ion b)Ammonium Chloride c)Ammonium nitrile d)None 70-There is a peptide molecule which is said to have molecular mass 11,312,it is termed as : a)Polypeptide b)Protein c)Both a & b d)None 71-Addition polymerization is catalyzed by : a)Thermal decomposition of organic peroxides b)Photochemical decomposition of organic peroxides c)Both d)None 72-Condensation polymerization involves the removal of : a)Water b)Methanol c)Ethanol d)All e)Both a & b 73-Polysterene is used in : a)Pipes b)Gramophone records c)Clothing d)Cosmetic bottles 74-Plyamide resisns include : a)Nylon -6,9 b)Nylon -3,6 c)Nylon -9,9 d)Nylon- 6.6 75-Glucose is also termed as : a)Dextrose b)Grape Sugar c)Blood Sugar

d)All e)Both b & c 76-Amylopectin has glycosidic linkages as : a)1,2 b)1,4 c)1,2 & 1,4 d)1,4 & 1,6 77-Woody trees are generally ___% celloluse : a)10% b)20% c)30% d)40% e)None 78-The saponification number for glycerol triplemitate is : a)206 b)208 c)210 d)212 79-In DNA the sugar is : a)1-Deoxyribose b)2-Deoxribose c)3-Deoxyribose d)None 80-The acid chloride strength is of the order of : a)CH3COOCl > CH3COOCl2 > CH3COOCl3 > CH3COOCl4 b) CH3COOCl < CH3COOCl2 > CH3COOCl3 < CH3COOCl4 c) CH3COOCl < CH3COOCl2