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某烷烃的相对分子质量为
A.
CH3CH2CH3
B.
CH3CH2CH2CH2CH3
C.
C20H42
D.
CH3(CH2)6CH3
已知某烃的相对分子质量为72,该烃可能是(?? )
①正戊烷 ②异丁烷 ③C5H10 ④(CH3)2CHCH2CH3??? ⑤(CH3)4C
A.③? ????? B.①②???????? C.①④⑤? ????? D.①③④⑤