| $(i)$ | $CH_3COCH_3$ $\xrightarrow{NaBH_4} CH_3CH(OH)CH_3$ $\xrightarrow{\text{conc. } H_2SO_4, \Delta} CH_3CH=CH_2$ |
| $(ii)$ | $C_6H_5COOH$ $\xrightarrow{SOCl_2} C_6H_5COCl$ $\xrightarrow{H_2/Pd-BaSO_4} C_6H_5CHO$ |
| $(iii)$ | $CH_3CH_2OH$ $\xrightarrow{PCC} CH_3CHO$ $\xrightarrow{\text{dil. } NaOH} CH_3CH(OH)CH_2CHO$ |
| $(iv)$ | $C_6H_6$ $\xrightarrow{CH_3COCl/AlCl_3} C_6H_5COCH_3$ $\xrightarrow{\text{conc. } HNO_3/H_2SO_4} m-NO_2-C_6H_4COCH_3$ |
| $(v)$ | $C_6H_5CHO$ $\xrightarrow[2. H_3O^+]{1. C_6H_5MgBr} C_6H_5CH(OH)C_6H_5$ $\xrightarrow{Na_2Cr_2O_7/H_2SO_4} C_6H_5COC_6H_5$ |
| $(vi)$ | $C_6H_5Br$ $\xrightarrow{Mg/\text{ether}} C_6H_5MgBr$ $\xrightarrow[2. H_3O^+]{1. CH_3CHO} C_6H_5CH(OH)CH_3$ |
| $(vii)$ | $C_6H_5CHO + CH_3CHO$ $\xrightarrow{\text{dil. } NaOH} C_6H_5CH=CHCHO$ $\xrightarrow{H_2/Ni} C_6H_5CH_2CH_2CH_2OH$ |
| $(viii)$ | $C_6H_5CHO$ $\xrightarrow{HCN} C_6H_5CH(OH)CN$ $\xrightarrow{H_3O^+} C_6H_5CH(OH)COOH$ |
| $(ix)$ | $C_6H_5COOH$ $\xrightarrow{\text{conc. } HNO_3/H_2SO_4} m-NO_2-C_6H_4COOH$ $\xrightarrow{B_2H_6} m-NO_2-C_6H_4CH_2OH$ |
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