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Which compound racemises ( looses optica...

Which compound racemises ( looses optical activity ) due to tautomerisation ?

A

B

C

`CH_(3)-underset(Br)underset(|)overset(H)overset(|)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`

D

`CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`

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The correct Answer is:
2
The following Structure are
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