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Ethane, Ethene, Ethanoic acid, Ethyne, Ethanol

(i) The compound -OH as the part of its structure

(ii) The compound with -COOH as part of its structure.

(iii) Homologue of homologous series with the general formula CnH2n


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Solution

(i) The compound -OH as the part of its structure:

  1. The molecular formula of Ethanol is C2H5OH and -OH is a functional group in it.
  2. Structure of Ethanol (C2H5OH) is as follows.


(ii) The compound with -COOH as part of its structure:

  1. The compound -COOH as a part of the structure is Ethanoic acid CH3COOH
  2. The common name of Ethanoic acid (CH3COOH) is Acetic acid.
  3. The molecular formula of Ethanoic acid is CH3COOH with -COOH a functional group.
  4. Structure of Ethanoic acid (CH3COOH):

(iii) Homologue of homologous series with the general formula CnH2n

Ethene belongs to the homologous series of Alkenes with general formula CnH2n.
The molecular formula of Ethene is C2H4
Structure of Ethene is as follows.

H2C=CH2


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