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# Complete the following reaction by filling in the necessary reagents.

$\begin{array}{1 1}(a)\;(1)NaCN,(2)PhmgBr,(3)H_3O^\oplus\\(b)\;(1)Alcl_3\;and\;Benzene,(2)PhmgBr,(3)H_3O^\oplus\\(c)\;(1)Mgmetal,(2)Benzene,(3)H_3O^\oplus\\(d)\;\text{Above all}\end{array}$

Can you answer this question?

Hence (a) is the correct answer.
answered Feb 20, 2014