Вкажіть гомологи: a) CH3-CH2-CH-CH3 I CH3 r) CH3-CH2-CH2-CH-CH3 I CH3 §20,21 A) CH3-CH2-CH2-CH2-CH3 x) CH3-CH-CH-CH3 I I CH3 CH3 б) CH3-CH-CH3 I CH3 B) CH3 I CH3-C-CH3 I CH3 e) CH3-CH2-CH2-CH3 3) CH3-CH2-CH2-CH2-CH2-CH3​