Which of the following can exist in diastereomeric form?

Question

TestHub · Accepted Answer

(A) 1,3-dichloroallene is axially chiral - it exists only as a pair of enantiomers, so it has no diastereomer.

(B) 1,2-dichloroethene exists as cis and trans forms, which are diastereomers:

structure $<$ $\to$

(C) C(F)(Cl)(Br)(I) has only one stereocentre - it exists only as a pair of enantiomers, so it has no diastereomer.

(D) The given form is meso-tartaric acid; the (2R,3R) and (2S,3S) forms are its diastereomers:

structure $<$ $\to$

Ans. (B, D)

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