Question

Arrange the following species in decreasing order, towards electrophilic addition reaction:
(I) $P{h}_{2}C=C{H}_2$
(II) Ph-CH = CHPh
(III) Ph-CH = CHMe

• A. I > III > II
• B. III > II > I
• C. I > II> III
• D. I = II> III

Answer 1

The correct option is A I > III > II

As the stability of carbocation increases, rate of the electrophilic addition increases.
Stability of carbocation $=(+R>+H>+I)\propto \frac{1}{(-R>-H-I)}$
(i)
(ii)
(iii)