All are“pentanes'” 2-me thylpe ntane 2,2,4-trime thylpe ntane CH3 CH CHCH3 CH3 CH3 (a)CH3CHCH2CH2CHg (b)CH3CH2CHCH2CH3 (c)CHCHCH2CCH CH3 2004 Thomson-Brooks/Cole 3-ethyl-2-methylpentane 2-methylpentane3-ethyl-2-methylpentane 2,2,4-trimethylpentane All are “pentanes