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Write the molecular formula of the 2nd and 3rd member of the homologous series whose first member is ethene. - Science

Write the molecular formula of the 2nd and 3rd member of the homologous series whose first member is ethene. 

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Solution

The general formula for the homologous series whose first member is ethene is CnH2n.

The two consecutive members (2nd and 3rd) of this series are: 

a. CH3CH=CH2 (Propene); where n is 3 

b. CH3CH2CH=CH2(1-Butene) or CH3CH=CHCH3 (2-Butene); where n is 4 

The molecular formulae are C3H6 and C4H8 respectively.

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