Ncert Exercises & Solutions

Electrophiles are electron seeking species. Which of the following groups contain only electrophiles?

1. ${BF}_{3}, {NH}_{3}, H_{2} O$

2. ${AlCl}_{3}, {SO}_{3}, {NO}_{2}^{+}$

3. ${NO}_{2}^{+} . {CH}_{3}^{+}, {CH}_{3} - C^{+} = O$

4. $C_{2} H_{5}^{-}, C_{2} H_{5}, C_{2} H_{5}^{+}$

(b, c)

All AlCl₃, SO₃ (Lewis acids),

{NO}_{2}^{+} . {CH}_{3}^{+}, {CH}_{3} - C^{+} = O

are electron deficient species.

Hence, these are electrophiles.