`R - CH_(2) - CH_(2) OH` can be covered into `RCH_(2) CH_(2) COOH`. The correct sequency of the reagents is

Options

A. `PBr_(3), KCN, H_(3) O^(+)`
B. `PBr_(3), KCN, H_(2)`
C. `HCN, PBr_(3), H^(+)`
D. `HCN, H^(+)`

Answer

A

Explanation

`R - CH_(2) CH_(2)OH overset (PHr_(3) to R - CH_(2) CH_(2) - Br`
`overset (RCN) to R - CH_(2) - CH_(2) - Cn overset (H_(2)O^(+)) to R - CH_(2) - CH_(2)COONa + CO_(2) + NH_(3)`