b Toluene undergoes oxidation with $K M n O_{4},$ fonns benzoic acid. In this conversion, alkyl part of toluene converts into carboxylic group. Further, benzoic acid reacts with thionyl chloride $\left(S O C l_{2}\right)$ to give benzoyl chloride which upon reduction with $H_{2} / P d$ or $B a S O_{4}$ forms benzaldehyde (Rosenmund reduction)
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