Which of the following pairs do not give the same compound on heating with alkaline potassium permanganate?(a) Toluene and propyl benzene(b) Toluene and n-Butyl benzene(c) Propyl benzene and isopropyl benzene(d) o-Xylene and n-Butyl benzeneI got this question by my college professor while I was bunking the class.Enquiry is from Methods of Carboxylic Acids Preparation topic in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Which of the following pairs do not give the same compound on heating

1.	Which of the following pairs do not give the same compound on heating with alkaline potassium permanganate?(a) Toluene and propyl benzene(b) Toluene and n-Butyl benzene(c) Propyl benzene and isopropyl benzene(d) o-Xylene and n-Butyl benzeneI got this question by my college professor while I was bunking the class.Enquiry is from Methods of Carboxylic Acids Preparation topic in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Answer» The correct option is (d) o-Xylene and n-Butyl benzene For explanation: All mono-substituted ALKYL benzenes, with primary or secondary alkyl groups, on VIGOROUS oxidation give benzoic acid. The entire side chain is oxidised irrespective of the length. In case of o-xylene, there are two methyl groups on the benzene RING and both of them are oxidised to carboxyl group, resulting in PHTHALIC acid.

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