Organic Chemistry Basics 1 Question 22
28. Which of the given statement(s) about $N, O, P$ and $Q$ with respect to $M$ is/are correct?
(2012)
(a) $M$ and $N$ are non-mirror image stereoisomers
(b) $M$ and $O$ are identical
(c) $M$ and $P$ are enantiomers
(d) $M$ and $Q$ are identical
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Answer:
Correct Answer: 28. $(\mathrm{b}, \mathrm{c}, \mathrm{d})$
Solution:
- Converting all of them into Fischer projection.
Since, $M$ and $N$ have $-\mathrm{OH}$ on same side and opposite side respectively, they cannot be miror image, they are diastereomers.
$M$ and $O$ are identical.
NOTE Fischer projection represents eclipse form of Sawhorse projection.
For comparision purpose, similar types of eclipse conformers must be drawn i.e. both vertically up or both vertically down.
$M$ and $P$ are non-superimposable mirror images, hence, enantiomers.
$Q$
$M$ and $Q$ are non-identical they are distereomers.
