Chemistry - Halogen Derivative Question with Solution | TestHub

Vinylic halides are organic compounds containing their halogen atom bonded to one of the two carbon atoms in the double bond present in that molecule.

Vinyl halide will not show ${\mathrm{S}}_{\mathrm{N}}1$ reaction, due to very
less stability of carbocation formed and partial
double bond character in C — Cl bond.

Since ${\mathrm{CH}}_3-\mathrm{CH}=\stackrel{+}{\mathrm{C}}\mathrm{H}$ is very unstable, ${\mathrm{CH}}_3-\mathrm{CH}=$ $\mathrm{CH}-\mathrm{Cl}$ cannot give ${\mathrm{S}}_{\mathrm{N}}1$ reaction.

Hence, the answer is B.