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Question

Which of the given statement(S) about N,O,P and Q with respect to M is (are correct)?

A
M and N are non-mirror image stereoisomers
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B
M and O are identical
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C
M and P are enantiomers
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D
M and Q are identical
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Solution

The correct option is C M and P are enantiomers
a.
i. In (M), Cl and CH3 are below the plane, so they are placed on vertical line of Fischer projection as shown in structure (M).

(ii) In (N), CH3 and Cl are below the plane, so they are placed on vertical line as shown in Fisher structure N.
So M and N are non-mirror image stereoisomers
b. Convert Sawhorse structure of (O) into Fischer projection formula.
Hence, (M) and (O) are identical.

c. Convert Newman projection of (P) into Sawhorse and then into Fischer formula
Hence, (M) and (P) are enantiomers.

d. Convert Newman projection of (Q) into Sawhorse and then into Fischer formula.

Cl and CH3 are below the plane and are placed on vertical line in Fischer formula.
So, (M) and (Q) are not identical. So statements (a), (b) and (c) are correct. Statements (d) is wrong.
The Fischer projection formula of (M), (N), (O), (P) and (Q) are represented as below:

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