b
\(\mathop {C{H_3} - C = C - H}\limits_{(A)} \xrightarrow{{A{g_2}O}}\) \(\mathop {C{H_3} - C \equiv C - Ag}\limits_{Whiteppt.}  \downarrow \)

\(\mathop {C{H_3} - C = C - H}\limits_{(A)} \xrightarrow{{H{g^{2 + }}\,/{H^ + }}}\) \(\mathop {\begin{array}{*{20}{c}}
  O \\ 
  {||} \\ 
  {{H_3}C - C - C{H_3}} 
\end{array}}\limits_{(B)} \) \(\xrightarrow{{NaB{H_4}}}\) \(\mathop {\begin{array}{*{20}{c}}
  {\begin{array}{*{20}{c}}
  {\,\,\,OH} \\ 
  | 
\end{array}} \\ 
  {C{H_3} - C - C{H_3}} \\ 
  | \\ 
  H 
\end{array}}\limits_{(C)} \) \(\xrightarrow[{Conc.\,HCl}]{{ZnC{l_2}}}\) Turbidity within \(5\) minutes