Order of reactivity is

Options

A. `R-overset(O)overset(||)C-X gt RCONH_(2) gt RCOOCOR gt RCOOR`
B. `RCOX gt RCOOCOR gt RCOOR gt RCONH_(2)`
C. `RCOOR gt RCONH_(2) gt RCOX gt RCOOCOR`
D. `RCOOCOR gt RCCOR gt RCOX gt RCONH_(2)`

Answer

B

Explanation

Increasing basicity order :
`X^(Ɵ) lt R- underset(O)underset(||)C-O^(Ɵ) lt H-underset(H)underset(|)N^(Ɵ)` Weaker bases are better leaving group so the order of reactivity of acid derivatives :
`R-underset(O)underset(||)C-X gt R-underset(O)underset(||)C-OCOR gt R - underset(O)underset(||)C-OR gt R-underset(O)underset(||)C-NH_(2)`