A hydrocarbon X is optically active. X upon hydrogenation gives an optically inactive alkane Y. Which of the following pair of compounds can be X and Y respectively?

4-methyl-2-hexene and 3-methylhexane

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3-methyl-1-pentene and 3-methylpentane

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4-methylcyclopentene and methylcyclopentane

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2- methyl-1-butene and 2-methylbutane

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Solution

The correct option is B 3-methyl-1-pentene and 3-methylpentane
$The optically active hydrocarbon X is 3-methyl-1-pentene (C H_{2} = C H - C H (C H_{3}) C H_{2} C H_{3})$ $which on catalytic hydrogenation forms an optically inactive compound 3-methylpentane (C H_{3} C H_{2} C H (C H_{3}) C H_{2} C H_{3}) .$

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