Q. No. 31. Which of the following statements regarding the E1
mechanism is wrong?
Option A Reactions by the E1 mechanism are unimolecular in
the
rate-determining step
Option B Reactions by the E1 mechanism are generally first order
Option C Reactions by the E1 mechanism usually occur in one step
Option D Reactions by the E1 mechanism are multi-step reactions
Correct Option C
Q. No. 32. Which of the following statements regarding the E2 mechanism is wrong?
Option A Reactions by the E2 mechanism are always bimolecular
Option B Reactions by the E2 mechanism are generally second
order
Option C Reactions by the E2 mechanism usually occur in one step
Option D Reactions by the E2 mechanism usually occur in two
steps
Correct Option D
Q. No. 33.Which of the following statements regarding
mechanisms of elimination reaction is wrong?
Option A The E1 mechanism does not require a base
Option B The E2 mechanism generally occurs under highly
basic
conditions
Option C The E2 mechanism is stereospecific
Option D The E1cB mechanism is usually unimolecular in the rate-
determining step but leads to a second order rate law
Correct Option A
Q. No. 34. Stereoisomers differ from each other in what
respect?
Option A Composition
Option B Constitution
Option C Configuration
Option D Steric hindrance
Correct Option C
Q. No. 35. Which of the following statements is not correct?
Option A a pair of enantiomeric compounds will have the same
melting
point
Option B a pair of enantiomeric compounds will have the same
solubility
in ethanol
Option C a pair of enantiomeric compounds will have exactly
the
same
functional groups
Option D a pair of enantiomeric compounds will have
identical
optical rotations
Correct Option D
Q. No. 36. What common symmetry elements if any are found in the stable chair conformer of trans-1,2-dichlorocyclohexane?
Option A A single mirror plane and a C2 rotational axis
Option B A single mirror plane and a C3 rotational axis
Option C Two orthogonal mirror planes and a C2 rotational axis
Option D A single C2 rotational axis but no mirror plane
Correct Option D
Q. No. 38. Which of the following statements must be true for
two pure chiral isomers ?
Option A They must be enantiomers
Option B They must be diastereomers
Option C They must be stereoisomers
Option D They must be optically active
Correct Option C
Q. No. 39. Which of the following compounds has no isomer?
Option A CH3CH2CH2Cl
Option B CH3CHO
Option C CH2=CHCl
Option D ClCH2CH2Cl
Correct Option C
Q. No. 40. Which of the following series contain a free radical, a nucleophile and an electrophile?
Option A Br- BF3NH3
Option B NH3 NO2+ Br2
Option C H2O Cl- NH3
Correct Option A
