Question

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

(i) \[\ce{BF3, NH3, H2O}\]

(ii) \[\ce{AlCl3, SO3, NO^{+}2}\] 

(iii) \[\ce{NO^{+}2, CH^{+}3, CH3 - \overset{+}{C} = O}\]

(iv) \[\ce{C2H^{-}5, \overset{\bullet}{C2}H5, C2H^{+}5}\]

Answer 1

(ii) \[\ce{AlCl3, SO3, NO^{+}2}\] 

(iii) \[\ce{NO^{+}2, CH^{+}3, CH3 - \overset{+}{C} = O}\]

Explanation:

Electrophilies are +vely charged or electron deficient species. They are Lewis acids. AlCl₃, SO₃ are Lewis acids, \[\ce{NO^{+}2, CH^{+}3, CH3 - \overset{+}{C} = O}\] are +vely charged species.