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Question

Which of the following are diasteromers?


A

(I) and (III)

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B

(II) and (IV)

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C

(I) and (II)

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D

None

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Solution

The correct option is C

(I) and (II)


The Fischer projection of (I) and (II) is wrond because the funtional group is not at the top. On rotating (I) and (II) by 180, they are represented as shown:

Now compare I, II, III and IV.

(I) and (III) Enantiomers
(II) and (IV) Identica or same
Therefore, the pairs of diastereomers are:
(I), (II); (I), (IV); and (II), (III).
But the answer given is (C), (I<II).


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