Organic Chemistry Basics - Result Question 76

####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. $(b, c, d)$

Solution:

  1. Converting all of them into Fischer projection.

Since, $M$ and $N$ have $-OH$ 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.



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