Each statement gives a structure and a proposed IUPAC name. Which of the following is/are correct?

A $(CH X_{3}) X_{3} C - CH X_{2} - CH X_{3}$ is 2,2-dimethylbutane.
B $CH X_{3} - CH X_{2} - CH X_{2} - CH (CH X_{3}) - CH X_{2} - CH X_{3}$ is 4-methylhexane.
C $CH X_{3} - CH X_{2} - CH (CH X_{3}) - CH X_{2} - CH X_{3}$ is 3-methylpentane.
D $CH X_{3} - CH (CH X_{3}) - CH (CH X_{3}) - CH X_{2} - CH X_{3}$ is 2,3-dimethylbutane.

Answer: A, C

3-Methylpentane is correct (five-carbon chain, methyl on C3). 2,2-Dimethylbutane is correct. The structure CH3-CH(CH3)-CH(CH3)-CH2-CH3 has a five-carbon longest chain, so it is 2,3-dimethylpentane and not 2,3-dimethylbutane. CH3-CH2-CH2-CH(CH3)-CH2-CH3 must be numbered from the right-hand end so that the methyl gets 3, giving 3-methylhexane, not 4-methylhexane.

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Each statement gives a structure and a proposed IUPAC name. Which of the following is/are correct?

Answer: A, C

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