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(A) The starting material is $1$-methylcyclohexene.Reaction $1$: Oxymercuration-demercuration using $(i) \ Hg(OAc)_2, H_2O$ and $(ii) \ NaBH_4$ follow

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Position isomers

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(A) The starting material is $1$-methylcyclohexene.Reaction $1$: Oxymercuration-demercuration using $(i) \ Hg(OAc)_2, H_2O$ and $(ii) \ NaBH_4$ follows Markovnikov's rule without rearrangement. The hydroxyl group $(-OH)$ attaches to the more substituted carbon (the carbon with the methyl group). Thus,product $(P)$ is $1$-methylcyclohexanol.Reaction $2$: Hydroboration-oxidation using $(i) \ BH_3-THF$ and $(ii) \ H_2O_2, NaOH$ follows anti-Markovnikov's rule. The hydroxyl group $(-OH)$ attaches to the less substituted carbon (the carbon adjacent to the one with the methyl group). Thus,product $(Q)$ is $2$-methylcyclohexanol.Comparing $(P)$ ($1$-methylcyclohexanol) and $(Q)$ ($2$-methylcyclohexanol),they have the same molecular formula and the same functional group,but the position of the $-OH$ group is different. Therefore,they are position isomers.

The major products of the following reactions are related as:

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