Question

The decreasing order of leaving group neucliophilic substitution reaction?

Answer 1

Explanation:

The leaving group ability decreases as the basicity of the nucleophile increases. Since the basicity increases in the order: Br−<Cl−<CH3COO−<HO−<H−, therefore, their leaving group ability decreases in the reverse order, i.e., Br−>Cl−>CH3COO−>HO−>H−.