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`R- CH_2 - CH_2 OH` can be converted in `R- CH_2 CH_2 COOH`. The correct sequence of reagents is

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`R- CH_2 - CH_2 OH` can be converted in `R- CH_2 CH_2 COOH`. The correct sequence of reagents is
A. `PBr_(3),KCN,H_(3)O^(+)`
B. `PBr_(3),KCN,H_(2)`
C. `KCN,H_(3)O^(+)`
D. `HCN,PBr_(3),H_(3)O^(+)`
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Correct Answer - A
`RCH_(2)CH_(2)OH overset(PBr_(3))toRCH_(2)CH_(2)Br overset(KCN)to RCH_(2)CH_(2)CN`
`overset(H_(2)O //H^(+))to RCH_(2)CH_(2)CO OH`
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