An unknown alkene with formula $C_{7} H_{12}$ undergoes oxidation by hot alkaline $K M n O_{4}$ to yield, after acidification $6 -$ ketoheptanoic acid.
Which of the following is that unknown alkene?
1) Methyl cyclohexene
2) Methyl cyclopentene
3) 2-methyl pentene

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Solution

The unknown alkene is Methyl cyclohexene. On heating with alkaline $K M n O_{4}$ , it forms 6-ketoheptanoic acid. In this reaction, the carbon carbon double bond is broken to form one carbonyl group and one carboxylic group.

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