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Q. From the following compounds/ions, how many are electrophiles?
$\overset{+}{CH_3} , \overset{+}NH_4 , BF_3, NH_3, NH_2 - NH_2, PCl_3, PCl_5, SbCl_5, GaCl_3, AlCl_3, F^-, \overset{+}{C}N, CH_3- Cl$ (“$C$” atom of halide)

Organic Chemistry – Some Basic Principles and Techniques

Solution:

Among the given compounds/ions $\overset{+}{C}H_3 ,BF_3,AlCl_3, GaCl_3, SbCl_5, PCl_5, PCl_3$ and $CH_3— Cl$ are electrophiles. In $CH_3— Cl, Cl— C$ bond is polar bond. Hence, carbon will have low energy anti-bonding orbitals.