State the observation : Bromine vapours are passed into a soln. of ethyne in carbon tetrachloride.

From – Ethyne, ethanol, acetic acid, ethene, methane. Choose the one which relates to (i) to (iv).

(i) An unsaturated hydrocarbon used for welding purposes.

(ii) An organic compound whose functional group is carboxyl.

(iii) A hydrocarbon which on catalytic hydrogenation gives a saturated hydrocarbon.

(iv) An organic compound used as a thermometric liquid.

Rewrite with the missing word/s:

Ethyl alcohol is dehydrated by sulphuric acid at a temperature of about 170°C.

Give the structural formula for the following :

(i) Methanoic acid

(ii) Ethanal

(iii) Ethyne

(iv) Acetone

(v) 2-methyl propane.