The set of compounds in which the reactivity of halogen atom in the ascending order is

Options

A. vinyl chloride, chloroethane, chlorobenzene
B. vinly chloride, chlorobenzene, chloroethane
C. chloroethane, chlorobenzene, vinyl chloride
D. chlorobenzene, vinyl chloriede, chloroethane

Answer

D

Explanation

In chloroethane the C-Cl bond is highly polar, C is the positive pole and Cl is the negative pole. This makes the C atom susceptible to nucleophilic attack. On the otherhand in chlorobenzene and vinyl chloride Cl atom is bonded to an `sp^(2)` hybridixsed C and the `pi` electrons of Cl are involved in `p-pi` conjugation which gives the C-Cl bond a double bond character and also reduces the dipole moment of C-Cl bond. since the Cl atom of chlorobenzene is in conjugation with a benzene ring C-Cl bond is much less polar. owing to the +R effect of Cl atom vinly chloride undergoes `S_(N)` reaction in drastic condition. The ascending order of reactivity of halogen atoms is chlorobenzene