Tlaloalkanes undergo nucleophilic substitution reaction whereas haloarenes undergo clectrophilic substitution reaction. Comment.

Tlaloalkanes undergo nucleophilic substitution reaction whereas haloar

1.	Tlaloalkanes undergo nucleophilic substitution reaction whereas haloarenes undergo clectrophilic substitution reaction. Comment.
Answer» Solution :Haloalkanes undergo nueleophilic substitution reactions due to high clectronegativity of the halogen atom. The C-X bond in haloalkanes is SLIGHTLY polar, thereby the C atom acquires a slight positive charge in C - X bond. Hence C atom is a good targetfor attack for nucleophiles. Therefore- X atom of haloalkanes is replaced by a nucleophile easily. `NU: + overset(DELTA+)R - overset(delta-)XTO R - Nu + X` On the other hand in HALOARENES, the halogen atom releases electron to the benzene nucleus relatively electron rich with respect to the halogen atom. As a result the electrophilic attack occursat ortho and para positions. Hence haloarenes undergo electrophilic substitutionreactions.