The decreasing order of nucleophilicity among the nucleophiles
is

Options

A. (i), (ii), (iii), (iv)
B. (iv), (iii), (ii), (i)
C. (ii), (iii), (i), (iv)
D. (iii), (ii), (i), (iv)

Answer

C

Explanation

The acidic strength follows the order:
`CH_3 - Ph - SO_3H gt CH_3 COOH gt HCN gt CH_3 OH`
Hence the basic character of conjugate base will follow the order:
`CH_3 O^(-) gt CN^(-) gt CH_3COO^(-) gt CH_3 - Ph - SO_3H`
Generally nucleophilicity follows the basic character, so the decreasing order of nucleophilicity:
(ii) > (iii)>(i)>(iv)