Question

In both alkyl halides, The halogen atom is attached directly to the carbon atoms. They are expected to exhibit similar reactivity. However,aryl halides are comparatively little reactive, particularly towards nucleophilic substitution reactions. For example, hydrolysis of ethyl chloride takes place by simple boiling with aqueous KOH. On the other hand, the alkaline hydrolysis of chlorobenzene needs a very high temperature (623 K) as well as very high pressure
Among the following, which has weakest C-X bond
A. benzyl bromide
B. Bromobenzene
C. Vinyl bromine
D. ethyl bromide

Answer 1

Correct Answer - A
`C_(6)H_(5)CH_(2)-Br` has weakest C-X. bond as `C_(6)H_(5)overset(o+)(C )H_(2)` ion is easily resonance stabilized. More over C-Br can cleave most easily.