Question

Among the following the strongest nucleophile is

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

A) Nucleophiles are those substances which can donate a pair of electrons. These can be neutral or negative. The nucleophilic power depends on the tendency of species to donate electron. This is more, when an electron pushing group (+I group) is present. Among the alkyl groups, those having higher number of C-atoms will push more, hence ethyl I> methyl.

$C2H_5\underset{(-I)}{\underset{C{H}_5+C{H}_2}{\underset{(+I)}{\twoheadrightarrow }}}S-H,C{H}_3\underset{(+I)}{\twoheadrightarrow }\stackrel{O}{\stackrel{||}{C}}-O^{-},C{H}_3\underset{(+I)}{\twoheadrightarrow }N{H}_2$