Choose the correct answer from the options given below:
(i) The number of C−H bonds in ethane molecule are:
(a) Four
(b) Six
(c) Eight
(d) Ten

(ii) The functional group present in acetic acid is:
(a) Ketonic (>C=O)
(b) Hydroxyl (− OH)
(c) Aldehydic (− CHO)
(d) Carboxyl (− COOH)

(iii) The unsaturated hydrocarbons undergo:
(a) a substitution reaction
(b) an oxidation reaction
(c) an addition reaction
(d) none of the above

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Solution

(i)
(b) Six
There are six C $-$ H bonds present in ethane.

(ii)
(d) Carboxyl (− COOH)
The functional group present in carboxylic acid is $-$ COOH.

(iii)
(c) an addition reaction
Unsaturated hydrocarbons undergo addition reactions.

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