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Identify Z in the following reaction seq...

Identify Z in the following reaction sequence.
`CH_(3)Iunderset("Ether")overset(Mg)rarrXunderset(H_(3)O^(+))overset("Dry ice")rarr Y underset("Red P")overset(Cl_(2))rarrZ`

A

`CH_(3)COOH`

B

`CH_(3)Mgl`

C

`CH_(3)COCl`

D

`ClCH_(2)COOH`

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The correct Answer is:
4
`CH_(3)I underset("Ether")overset(Mg)rarrCH_(3)MgI underset(H_(2)O^(+))overset("Dry ice")rarrCH_(3)COOHunderset("Red P")overset(Cl_(2))rarrunderset((alpha-"halogenation"))(Cl-CH_(2)-COOH)`
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