Помогите, пожалуйста, химия 9 класс.

1) Только формулы углеводородов в ряду:
а) CCl4, CH4, C2H4
б) C2H6, C6H6, C6H5Cl
в) C3H8, C3H6, C2H2
г) CH3Cl, C6H12, CH2O

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