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Complete the following reactions with ap...

Complete the following reactions with appropriate structures of product/reagents :
`C_6 H_5 CH= CH_2 overset(Br_2)to [A] underset((ii) CH_3 I)overset((i)NaNH_2 (3 "equivalent"))to [B]`

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Thus, [A] is 1,2-dibromo-1-phenylethane and [B] is 1-phenylpropyne.
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