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In the given transformation which of the following is the most appropriate reagent?

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In the given transformation which of the following is the most appropriate reagent?
image
A. Zn-Hg/HCl
B. Na in liq. `NH_(3)`
C. `NaBH_(4)`
D. `NH_(2)-NH_(2).OH^(-)`
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Correct Answer - D
Both Zn(Hg) HCl and `NH_(2)-NH_(2)," "OH^(-)` can reduce `COCH_(3)` group to `CH_(2)CH_(3)` group but HCl will also bring about substitution of OH by Cl `therefore` the most effective reagent is `NH_(2)-NH_(2)OH`.
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