Q26 of 312 Page 240

Write the molecular formulae of the third and fifth members of homologues series of carbon compounds represented by the general formula CnH2n+2

The molecular formula of third and fifth members of alkanes series are C3H8 and C5H12.

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26 Give the general name of the class of compounds having the general formula CnH2n-2. Write name of the first member of this homologues series. 26 The general formula of a homologues series of carbon compounds is CnH2n. Write the molecular formulae of the second and fourth members of the series. 27 (a) Give the names and structural formulae of the next two higher homologues of methane.

(b) The molecular formula of a hydrocarbon is C2H5. Name its homologues series.


(c) Select the hydrocarbons which are members of the same homologues series. Give the name of each series. C5H10; C3H8; C4H10; C7H12; C8H16

 28 (a) Give the molecular formula of one homologue of each of the following:

(i) C3H6


(ii) C2H6


(iii) C2H2