(a) What is isomerism ? Name the isomers of butane.
(b) Name the air pollutant liberated during incomplete combustion of methane.
(c) Name the importance of hydrogenation of oils.

Explanation

(a) Phenomenon in which organic compounds have same molecular formula with different structural arrangement of atoms in them is known as isomerism.
n-butane and iso-butane.
(b) Carbon monoxide (CO)
(c) Hydrogenated oils.
(i) have more shelf life, easy to transport.
(ii) do not produce foul smell.