Which of the following statements about the systematic names of alkyl groups is/are correct?

A $- CH X_{2} - CH (CH X_{3}) X_{2}$ is the 2-methylpropyl group (isobutyl).
B $- C (CH X_{3}) X_{3}$ is the 1,1-dimethylethyl group (tert-butyl).
C $- CH (CH X_{3}) X_{2}$ is the 1-methylethyl group (isopropyl).
D $- CH (CH X_{3}) - CH X_{2} - CH X_{3}$ is the 1-methylpropyl group (sec-butyl).

Answer: A, B, C, D

Number every substituent group from the carbon that is attached to the parent chain (C1). In -CH(CH3)2 there is a methyl on C1 of an ethyl group. In -CH2-CH(CH3)2 the methyl is on C2 of a propyl group. In -C(CH3)3 two methyls are on C1 of an ethyl group. In -CH(CH3)CH2CH3 the methyl is on C1 of a propyl group. All four statements are correct.

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Which of the following statements about the systematic names of alkyl groups is/are correct?

Answer: A, B, C, D

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