How many different monochlorination products (monochloroalkanes) can the alkane shown give? Count constitutional isomers only and ignore stereoisomers.

Answer: B

The alkane is 2-methylpropane (isobutane). It has two kinds of hydrogen: nine equivalent H on the three methyls and one tertiary H. Replacing either gives 1-chloro-2-methylpropane or 2-chloro-2-methylpropane, so 2 products.

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