Question

LPG is a hydrocarbon consisting of mixture of:
 A. Methane and butane
 B. Propane and butane
 C. Ethane and propane
 D. Ethane and butane

Answer 1

Hint: L.P.G comprises gases which are the third and fourth member of the alkane family . Also, L.P.G is flammable due to the presence of a third member of the alkane family.

Complete Step by Step solution:
As we are already aware that LPG stands for Liquified Petroleum Gas.
It is highly flammable gas and is a mixture of several hydrocarbons including propane and butane due to which LPG is flammable.
LPG gases can be easily liquified by applying pressure and turns into gas on removing the pressure.
Also, there are several ways by which LPG is separated into three primary parts name propane, butane and isobutane and is produced as a byproduct of natural gas processing and petroleum refining.
It is primarily used in homes for cooking purposes and also used as a vehicle fuel.
Ethanethiol also known as mercaptan is added to LPG gas to impart characteristic smell.
Therefore, on above grounds it can be easily concluded that LPG is a hydrocarbon consisting of a mixture of propane and butane. So, option B is the correct answer.

Additional Information:
LPG gases are considered as non-toxic gases, so their leakage is not a matter of concern as such.
LPG gases at atmospheric temperature and pressure are almost twice heavier than air.

Note: LPG gas is an odorless gas. The characteristic smell is due to the addition of ethanethiol.
Also, it should be remembered that gases like propane and butane makes LPG flammable.
It is a versatile gas as it can be used both for cooking and also as vehicle fuel.