Đáp án C
CH3CH2OH → H 2 SO 4 , t o CH2 = CH2 + H2O
CH3-CH(OH)-CH3 → H 2 SO 4 , t o CH3-CH=CH2 + H2O
CH3-CH2-CH2OH → H 2 SO 4 , t o CH3-CH=CH2 + H2O
(CH3)2CH-CH2OH → H 2 SO 4 , t o (CH3)2C=CH2 + H2O
(CH3)C-OH → H 2 SO 4 , t o (CH3)2C=CH2 + H2O
(CH3)2CH-CH(OH)-CH3 → H 2 SO 4 , t o