A)
B)
C)
D)
E) None of the above
Correct Answer: E
Solution :
Allylic and benzylic halides show high reactivity towards \[{{S}_{N}}1\] reaction further, due to greater stabilization of allyl and benzyl carbocations intermediates by resonance, primary allylic and primary benzylic halides show higher reactivity in \[{{S}_{N}}1\] reactions than other simple primary halides. \[{{H}_{3}}C-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,=CH-C{{H}_{2}}-Cl\overset{\,}{\longleftrightarrow}\] \[\underset{{{\text{2}}^{\text{o}}}\,\text{-allyl}\,\,\text{cation}}{\mathop{{{H}_{3}}C-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}}}\,\overset{\,}{\longleftrightarrow}\,\underset{{{\text{1}}^{\text{o}}}\text{-allyl}\,\,\text{cation}}{\mathop{{{H}_{3}}C-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,=CH-\overset{+}{\mathop{C}}\,{{H}_{2}}}}\,\] Hence, it undergoes nucleophilic reaction readily.
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