BITSAT Chemistry Organic Chemistry Some Basic Principles and Techniques MCQs Set B

Question: According to IUPAC system, the correct name of the compound having the formula

a) 2-ethyl-3-methyl but-1-ene

b) 2-methyl pent-3-ene

c) 2-methyl but-1-ene

d) None of these

Answer: None of these

Question: Liebig’s method is used for the estimation of

a) N

b) S

c) C and H

d) Halogens

Answer: C and H

Question: Hyperconjugation involves

a) σ – π conjugation

b) σ – π delocalisation

c) No bond resonance

d) All

Answer: σ – π conjugation

Question: The intermediate formed during the addition of HCl to propene in the presence of peroxide is

a)

b)

c)

d)

Answer:

Question: Which of the following has zero dipole moment?

a) 1, 1-dichloromethane

b) cis-1, 2-dichloroethene

c) Trans-1, 2-dichloroethene

d) 1-chloroethane

Answer: Trans-1, 2-dichloroethene

Question: Keto-enol tautomerism is observed in

a)

b)

c)

d) None

Answer:

Question: The restricted rotation about carbon-carbon double bond in 2- butene is due to

a) Overlap of one s- and one sp²-hybridized orbitals

b) Overlap of two sp²-hybridized orbitals

c) Overlap of one p-and one sp²-hybridized orbitals

d) Sideways overlap of two p-orbitals

Answer: Sideways overlap of two p-orbitals

Question: IUPAC name of CH₃CH(CH₃)COOHis

a) Dimethyl acetic acid

b) 2 - Methylpropanoic acid

c) Propionic acid

d) Butyric acid

Answer: 2 - Methylpropanoic acid

Question: IUPAC name of the compound

a) ethyl-3-methyl-2-(3-nitro) phenyl butanoate

b) ethyl-2-methyl-2-(m-nitro) phenyl propanoate

c) ethyl-2-methyl-2-(3-nitro) phenyl propanoic acid

d) None of the above

Answer: ethyl-3-methyl-2-(3-nitro) phenyl butanoate

Question: Example of chlorinolyis is

a)

b)

c)

d)

Answer:

Question: The reaction :

a) Elimination reaction

b) Substitution reaction

c) Free radical reaction

d) Displacement reaction

Answer: Substitution reaction

Question: The addition of HCN to a carbonyl compound is an example of

a) Nucleophilic substitution

b) Electrophilic addition

c) Nucleophilic addition

d) Electrophilic substitution

Answer: Nucleophilic addition

Question: Among the following compounds which is most reactive towards nitration

a) Benzene

b) Nitrobenzene

c) Toluene

d) Chloro benzene

Answer: Toluene

Question:

electrophilic substitution will occur at

a) Meta in second ring

b) Ortho/para in the first ring

c) Meta in the first ring

d) Ortho/para in the second ring

Answer: Ortho/para in the second ring

Question: Which is a pair of geometrical isomers ?

a) I and II

b) I and III

c) II and IV

d) III and IV

Answer: II and IV

Question: The IUPAC name of the compound is

a) 3, 3-dimethyl - 1- cyclohexanol

b) 1, 1-dimethyl-3-hydroxy cyclohexane

c) 3, 3-dimethyl-1-hydroxy cyclohexane

d) 1, 1-dimethyl-3-cyclohexanol

Answer: 3, 3-dimethyl - 1- cyclohexanol

Question: Which of the following compounds is isomeric with 2, 2, 4, 4- tetramethylhexane?

a) 3-ethyl -2, 2- dimethylpentane

b) 4-isopropylheptane

c) 4-ethyl-3-methyl-4-n-propyloctane

d) 4, 4-diethyl-3-methylheptane

Answer: 4-isopropylheptane

Question: The systematic name of

  is

a) 1-Methyl-1 aminopropane

b) 2-Butanamine

c) 2-Methyl-2 aminopropane

d) None of these

Answer: 2-Butanamine

Question: The compound which gives the most stable carbonium ion on dehydration :

a) 2-Methylpropanol

b) 2-Methylprop-2-ol

c) Butanol

d) But-2-ol

Answer: 2-Methylprop-2-ol

Question: Which of the followings is most stable ?

a)

b)

c)

d)

Answer:

Question: Arrange the following in order of decreasing basicity

A. CH₃CH₂MgBr

B. HC ≡ CMgBr

C. CH₃CH₂OMgBr

a) A > C > B

b) A > B > C

c) C > B > A

d) B > A > C

Answer: A > B > C

Question: The order of decreasing stability of the carbanions

(CH₃ )₃C ^-(I);(CH₃ )₂CH^- (II);CH₃CH₂ ^-(III);C₆H₅CH_2^- (IV) is

a) I > II > III > IV

b) IV > III > II > I

c) IV > I > II > III

d) I > II > IV > III

Answer: IV > III > II > I

Question: A compound with molecular formula, C₇H₁₆ shows optical isomerism, the compound will be

a) 2, 3-dimethylpentane

b) 2, 2-dimethylpentane

c) 2-methylhexane

d) None of these

Answer: 2, 3-dimethylpentane

Question: The IUPAC name of the compound  is

a) 1, 2, 3 - Tricyanopropane

b) 3 - Cyanopentane - 1, 5 -dinitrile

c) 1, 2, 3 - Cyanopropane

d) Propane trinitrile - 1, 2, 3

Answer: 3 - Cyanopentane - 1, 5 -dinitrile

Question: In paper chromatography

a) Mobile phase is liquid and stationary phase is solid

b) Mobile phase is solid and stationary phase is liquid

c) Both phases are liquids

d) Both phases are solids

Answer: Both phases are liquids

Question: Liebig’s method is used for the estimation of

a) N

b) S

c) C and H

d) Halogens

Answer: C and H

Question: Which of the following has zero dipole moment?

a) 1, 1-dichloromethane

b) cis-1, 2-dichloroethene

c) trans-1, 2-dichloroethene

d) 1-chloroethane

Answer: trans-1, 2-dichloroethene

Question: The addition of HCN to a carbonyl compound is an example of

a) Nucleophilic substitution

b) Electrophilic addition

c) Nucleophilic addition

d) Electrophilic substitution

Answer: Nucleophilic addition

Question: Among the following compounds which is most reactive towards nitration

a) Benzene

b) Nitrobenzene

c) Toluene

d) Chloro benzene

Answer: Toluene

Question: The compound which gives the most stable carbonium ion on dehydration

a) 2-Methylpropanol

b) 2-Methylprop-2-ol

c) Butanol

d) But-2-ol

Answer: 2-Methylprop-2-ol