\(\text{CH}_3(\text{CH}_2)_5\text{COOC}_2\text{H}_5 \xrightarrow{\text{DIBAL-H, H}_2\text{O}} \text{CH}_3(\text{CH}_2)_5\text{CHO}\)
\(\text{C}_6\text{H}_5\text{COC}_6\text{H}_5 \xrightarrow{\text{Zn(Hg) \& conc. HCl}} \text{C}_6\text{H}_5\text{CH}_2\text{C}_6\text{H}_5\)
\(\text{C}_6\text{H}_5 \xrightarrow{\text{CH}_3\text{MgBr, H}_2\text{O}} \text{C}_6\text{H}_5\text{CH(OH)CH}_3\)
\(\text{CH}_3\text{COCH}_2\text{COOC}_2\text{H}_5 \xrightarrow{\text{NaBH}_4, \text{H}^+} \text{CH}_3\text{CH(OH)CH}_2\text{COOC}_2\text{H}_5\)