Question

Choose the correct reagents used in the conversion.
\[C{{H}_{2}}=C{{H}_{2}}\xrightarrow{\left( p \right)}\underset{\begin{smallmatrix} |\,\,\,\,\,\,\,\, \\ Br\,\,\,\,\,\,\, \end{smallmatrix}}{\mathop{C{{H}_{2}}}}\,-\underset{\begin{smallmatrix} |\,\,\,\,\,\,\,\, \\ Br\,\,\,\,\,\,\, \end{smallmatrix}}{\mathop{C{{H}_{2}}}}\,\]      \[\xrightarrow{\left( q \right)}C{{H}_{2}}=CHBr\xrightarrow{\left( r \right)}\]     \[CH\equiv CH\xrightarrow{\left( s \right)}\]   

	$$p$$	$$q$$	$$r$$	$$s$$
(a)	$$B{r_2}$$	$${\text{alc}}.\,KOH$$	$$NaOH$$	$$A{l_2}{O_3}$$
(b)	$$HBr$$	$${\text{alc}}.\,KOH$$	$$Ca{C_2}$$	$$KMn{O_4}$$
(C)	$$HBr$$	$${\text{alc}}.\,KOH$$	$$NaN{H_2}$$	red hot iron tube
(d)	$$B{r_2}$$	$${\text{alc}}.\,KOH$$	$$NaN{H_2}$$	red hot iron tube