Indentify the unsaturated compounds from the following.
(i) Propane
(ii) Propene
(iii) Propyne
(iv) Chloropropane

Options

A. (i) and (ii)
B. (ii) and (iv)
C. (iii) and (iv)
D. (ii) and (iii)

Answer

D

Explanation

A hydrocarbon in which the two carbon atoms are connected by a 'double bond' or a 'triple bond' is called an unsaturated hydrocarbon.
(ii) Propene, `CH_(3)CH=CH_(2)` and (iii) propyne `CH_(3)-C-=` both have double and triple bonds, respectively hence unsaturated. Propane and chloropropane are saturated hydrocarbons which contain only single bonds.