Question

The correct statement(s) for the following addition reactions is(are):

• A. bromination proceeds through trans-addition in both the reactions.
• B. $O$ and $P$ are identical molecules.
• C. ($M$ and $O$) and ($N$ and $P$) are two pairs of diastereomers.
• D. ($M$ and $O$) and ($N$ and $P$) are two pairs of enantiomers.

Answer 1

Answer: (A), (C)

The correct options are
A bromination proceeds through trans-addition in both the reactions.
C ($M$ and $O$) and ($N$ and $P$) are two pairs of diastereomers.

Addition of halogens is stereospecific reaction. Trans-2-butene gives meso product whereas the cis-isomer gives racemic mixture.
The following statements are correct statements
(A) Bromination proceeds through trans-addition in both the reactions. It involves formation of cyclic bromonium ion.
(C) (M and O) and (N and P) are two pairs of diastereomers. They have same configuration at one chiral carbon atom and different configuration at other chiral carbon atom.
The following are incorrect statements
(B) "O and P are identical molecules"
The correct statement is
"O and P are pair of enantiomers". They are non superimposable mirror images of each other.
(D) "(M and O) and (N and P) are two pairs of enantiomers".
The correct statement is
"(M and O) and (N and P) are two pairs of diastereomers".