$[I]$ મિથેનોઇક એસિડ $[II]$ ઇથેનોઇક એસિડ
$[III]$ પ્રોપેનોઇક એસિડ $[IV]$ બ્યુટેનોઇક એસિડ
\(\mathop {HCOOH}\limits_I > \mathop {C{H_3}COOH}\limits_{II} > \mathop {C{H_3}C{H_2}COOH}\limits_{III} > \mathop {C{H_3}C{H_2}C{H_2}COOH}\limits_{IV} \)
$C{H_3}COOH\xrightarrow{{SOC{l_2}}}A\mathop {\xrightarrow{{Benzene}}}\limits_{Anhr.\,AlC{l_3}} B\xrightarrow{{HCN}}C\xrightarrow{{HOH}}D.$