a)
\(C{H_3}COOC{H_3} + {H_2}O\overset {{H^ + }} \leftrightarrows C{H_3}COOH + C{H_3}OH\)
b)
\(HCOOC_2{H_5} + {H_2}O\overset {{H^ + }} \leftrightarrows HCOOH + C_2{H_5}OH\)
c)
\(HCOOC{H_3} + {H_2}O\overset {{H^ + }} \leftrightarrows HCOOH + C{H_3}OH\)
d)
\(C{H_3}COOC_2{H_5} + {H_2}O\overset {{H^ + }} \leftrightarrows C{H_3}COOH + C_2{H_5}OH\)