In the following reaction,
`R-CH_(2)overset(Br_(2)//p)toXoverset("Excess" NH_(3))toY`
the major amounts of X and Y are:

Options

A. `R CHBr CONH_(2), R CH(NH_(2)) COOH`
B. `R CHBr CONH, R CH(NH_(2)) COOH`
C. `R CH_(2)COBr, R CH_(2) COONH_(4)`
D. `R CHBr COOH, R CH_(2) CONH_(2)`

Answer

B

Explanation

When aan acid is heated with `Br_(2)` in the presence P, `alpha`- H atom of the acid is replaced by bromine atom. This reaction is called Hell- Volhard-Zelinsky reaction. `NH_(2)^(-)` is a better nucleophile than `Br^(-)`
`RCH_(2)COOH overset(Br_(2)//P) underset("HVZ reaction")to underset((X)) underset(Br)underset(|)(R-CH-COOH) overset("Excess") to underset((Y)) underset(NH_(2)) underset(|) (R-CH-COOH)`