$[I]$ 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 + PC{l_5} \to A\mathop {\xrightarrow{{{C_6}{H_6}}}}\limits_{anh.\,AlC{l_3}} $ $B\mathop {\xrightarrow{{{C_2}{H_5}MgBr}}}\limits_{ether} C$

