Select the correct answer from the choices a, b, c and d which are given.
Write only the letter corresponding to the correct answer.
(i) An organic compound undergoes addition reactions and gives a red colour precipitate with ammoniacal cuprous chloride. Therefore, the organic compound could be:
(a) Ethane
(b) Ethene
(c) Ethyne
(d) Ethanol

(ii) The organic compound mixed with ethanol to make it spurious is:
(a) Methanol
(b) Methanoic acid
(c) Methanal
(d) Ethanoic acid

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Solution

(i)
(c) Ethyne
Ethyne contains a terminal triple bond, therefore, it gives red precipitate with ammoniacal cuprous chloride. It undergoes addition reactions due to presence of a multiple bond.

(ii)
(a) Methanol
Methanol is poisonous and thus, it renders ethanol unfit for drinking purposes.

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(i) (c) Ethyne Ethyne contains a terminal triple bond, therefore, it gives red precipitate with ammoniacal cuprous chloride. It undergoes addition reactions due to presence of a multiple bond. (ii) (a) Methanol Methanol is poisonous and thus, it renders ethanol unfit for drinking purposes.

(i)
(c) Ethyne
Ethyne contains a terminal triple bond, therefore, it gives red precipitate with ammoniacal cuprous chloride. It undergoes addition reactions due to presence of a multiple bond.

(ii)
(a) Methanol
Methanol is poisonous and thus, it renders ethanol unfit for drinking purposes.