What 'X' in the following reaction ? ...

What 'X' in the following reaction ?
`C_(6)H_(5) -C-=C-H overset(Hg^(+2))underset("dil" .H_(2)SO_(4))rarr X`

A

`C_(6)H_(5) - COCH_(3)`

B

`C_(6)H_(5) - CH_(2)CHO`

C

`C_(6)H_(5) - CHO`

D

`C_(6)H_(5) - CH_(2)OH`

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The correct Answer is:

A

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