question_answer

the type of reaction is

A)  electrophilic substitution

B)  nucleophilic substitution

C)  free radical substitution

D)  None of the above

Correct Answer: B

Solution :

Electrophilic substitution reaction Electrophilic substitution involves the attack by an electrophile. eg, \[C{{H}_{3}}C{{H}_{2}}MgBr\xrightarrow[-MgBr]{}\overset{\oplus }{\mathop{C}}\,{{H}_{3}}C{{H}_{2}}\]\[\xrightarrow{{{H}^{+}}}C{{H}_{3}}C{{H}_{3}}\] Nucleophilic substitution reaction Many substitution reactions, especially at the saturated carbon atom in aliphatic compounds such as alkyl halides, are brought about by nucleophilic reagents or nucleophiles. \[R-X+\underset{nucleophile}{\mathop{O{{H}^{-}}}}\,\xrightarrow{{}}R-OH+\underset{\begin{smallmatrix}  leaving \\  group \end{smallmatrix}}{\mathop{{{X}^{\Theta }}}}\,\] Such substitution reactions are called nucleophilic substitution reactions. eg, Free radical substitution Free radical substitution reactions involve the attack by a free radical. eg, \[C{{H}_{4}}+C{{l}_{2}}\,\,\xrightarrow[light]{UV}C{{H}_{3}}Cl+HCl\]