b
\(CH_3CHO\) \(+\) \(H_3CCHO\) (એસિટાલ્ડીહાઇડ ) \( \xrightarrow {NaOH}\) \(\begin{array}{*{20}{c}}{\,\,\,\,\,OH\,\,\,\, \,\,\,\, \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\,\,\,\, \,\,\,\, \\ {C{H_3} - CH - C{H_2}C{H_3}CHO} \end{array}\,\,\,\) (આલ્ડોલ)