(a) Give the molecular formula of one homologue of each of the following:
(i) C₃H₆
(ii) C₂H₆
(iii) C₂H₂
(b) What is the difference in the molecular mass of any two adjacent homologues?
(c) By how many carbon atoms and hydrogen atoms do any two adjacent homologues differ?

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Solution

(a)
(i) The molecular formula of a homologue of C₃H₆is C₄H₈. It belongs to the homologous series of alkenes having the general formula C_nH_2n.
(ii) The molecular formula of a homologue of C₂H₆ is C₃H₈. It belongs to the homologous series of alkanes having the general formula C_nH_2n₊₂.
(iii) The molecular formula of a homologue of C₂H₂is C₃H₄. It belongs to the homologous series of alkynes having the general formula C_nH2n-2.

(b) The difference in the molecular masses of any two adjacent homologues is 14u.

(c) Any two adjacent homologues differ by 1 carbon atom and 2 hydrogen atoms in their molecular formulae.

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(a) Give the molecular formula of one homologue of each of the following: (i) C3H6 (ii) C2H6 (iii) C2H2 (b) What is the difference in the molecular mass of any two adjacent homologues? (c) By how many carbon atoms and hydrogen atoms do any two adjacent homologues differ?

(a) Give the molecular formula of one homologue of each of the following:
(i) C₃H₆
(ii) C₂H₆
(iii) C₂H₂
(b) What is the difference in the molecular mass of any two adjacent homologues?
(c) By how many carbon atoms and hydrogen atoms do any two adjacent homologues differ?