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

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

a) 2, 3-Dimethylpentane

b) 2,2-Dimethylbutane

c) 3-Methylhexane

d) None of the above

Answer: 2, 3-Dimethylpentane

Question: Which of the following does not contain Plane of symmetry?

a) Trans-1,3 dichloro cyclohexane

b) Trans-1,2 dichloro cyclohexane

c) Cis-1,2 dichloro cyclohexane

d) Trans-1,3 cyclopentane

Answer: Cis-1,2 dichloro cyclohexane

Question: The correct statement about the compounds A, B, and C

       (A)

      (B) 

   (C)

a) A and B are identical

b) A and B are diastereomers

c) A and C are enantiomers

d) A and B are enantiomers

Answer: A and B are enantiomers

Question: Which of the following compounds has all the four types (1°, 2°, 3° and 4°) of carbon atoms?

a) 2, 3, 4-Trimethylpentane

b) neo-Pentane

c) 2, 2, 4-Trimethylpentane

d) None of the three

Answer: 2, 2, 4-Trimethylpentane

Question: Which of the following has two stereoisomers?

a) None of these

b) Only I

c) Only III

d) I and III

Answer: Only I

Question: The anthracene is purified by

a) Crystallisation

b) Filtration

c) Distillation

d) Sublimation

Answer: Sublimation

Question: Which of the following compounds has wrong IUPAC name?

a)

b)

c)

d)

Answer:

Question: Consider the following carbocations

The correct sequence for the stability of these is

a) II < I < III < IV

b) II < III < I < IV

c) III < I < II < IV

d) IV < III < I < II

Answer: II < I < III < IV

Question: Arrangement of (CH₃)₃ C –, (CH₃)₂ CH –, CH₃ CH₂ – when attached to benzyl or an unsaturated group in increasing order of inductive effect is

a) (CH₃)₃C – < (CH₃)₂ CH – < CH₃ CH₂–

b) CH₃CH₂– < (CH₃)₂CH – < (CH₃)₃C –

c) (CH₃)₂CH – <(CH₃)₃C – < CH₃CH₂–

d) (CH₃)₃C – < CH₃CH₂ – < (CH₃)₂CH –

Answer: CH₃CH₂– < (CH₃)₂CH – < (CH₃)₃C –

Question: The most stable carbanion among the following is

a)

b)

c)

d)

Answer:

Question: Among the following four structures I to IV,

it is true that

a) Only I and II are chiral compounds

b) Only III is a chiral compound

c) Only II and IV are chiral compounds

d) All four are chiral compounds

Answer: Only I and II are chiral compounds

Question: The number of enantiomers of the compound

CH₃CHBrCHBrCOOH is

a) 0

b) 1

c) 3

d) 4

Answer: 4

Question: he following two compounds are

    are

a) Enantiomers

b) Diastereomers

c) Identical

d) Epimers

Answer: Diastereomers

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: In which case the   will attack at the meta position

a) I, II, III

b) II, IV

c) II and III only

d) II only

Answer: I, II, III

Question: Which of the following compound is not chiral?

a) DCH₂CH₂CH₂Cl

b) CH₃CHDCH₂Cl

c) CH₃CHClCH₂D

d) CH₃CH₂CHDCl

Answer: DCH₂CH₂CH₂Cl

Question:

 exhibit which type of isomerism?

a) Position

b) Functional

c) Demotropism

d) Position isomerism

Answer: Functional

Question: The correct nucleophilicity order is

a)

b)

c)

d)

Answer:

Question: In the anion HCOO^– the two carbon-oxygen bonds are found to be of equal length. what is the reason for it ?

a) The C = O bond is weaker than the C — O bond

b) The anion HCOO^– has two resonating structures

c) The anion is obtained by removal of a proton from the acid molecule

d) Electronic orbitals of carbon atom are hybridised

Answer: The anion HCOO^– has two resonating structures

Question: The number of geometrical isomers of CH₃CHCH – CH = CH – CHCHCl is

a) 2

b) 4

c) 6

d) 8

Answer: 8