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Question

PhCH=NO2Hisomerises3 days(x)(5050%), Isomer (x) is:

A
PhNOCH2OH
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B
PhCH2NO2
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C
PhNHCO2H
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D
None
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Solution

The correct option is B PhCH2NO2
This is keto-enol reaction. In fact, the precise name for this type of reaction is Nitro-acinitro tautomerism. These two forms are always in equilibrium with each others so, in product side we will have both the isomers ie, nitro (PHCH2NO2) and acinitroform (PhCHNO2H). So, x will be PHCH2NO2 and isomer of x refers to PHCH2NO2 itself. And PHCH2NO2 is optically inactive.

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