- C3H8O:
(1) $CH_3-CH_2-CH_2-OH$ (ancol bậc I)
(2) $CH_3-CHOH-CH_3$ (ancol bậc II)
- C4H10O:
(3) $CH_3-CH_2-CH_2-CH_2OH$ (ancol bậc I)
(4) $CH_3-CHOH-CH_2-CH_3$ (ancol bậc II)
(5) $CH_2OH-CH(CH_3)-CH_3$ (ancol bậc I)
(6) $CH_3-C(OH)(CH_3)-CH_3$ (ancol bậc III)
Ancol tách nước tạo 1 anken: (1), (2), (3), (5).