Question

LPG is a mixture of:
(A) ${{\text{C}}_{\text{6}}}{{\text{H}}_{\text{12}}}\,\text{+}\,{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}}$
(B) ${{\text{C}}_{4}}{{\text{H}}_{10}}\,\text{+}\,{{\text{C}}_{3}}{{\text{H}}_{8}}$
(C) ${{\text{C}}_{2}}{{\text{H}}_{4}}\,\text{+}\,{{\text{C}}_{2}}{{\text{H}}_{2}}$
(D) ${{\text{C}}_{2}}{{\text{H}}_{4}}\,\text{+}\,\text{C}{{\text{H}}_{4}}$

Answer 1

LPG stands for liquid petroleum gas.
Petroleum compounds are alkanes that are why alkenes are also known as paraffin’s (petrol forming compounds).
Alkanes containing carbon ${{\text{C}}_{\text{1}}}\text{-}{{\text{C}}_{\text{4}}}$ are mainly forms petroleum gases, which have been used as a fuel making of carbon black, ${{\text{H}}_{\text{2}}}$ and other gasoline.
Alkanes containing carbon ${{\text{C}}_{5}}\text{-}{{\text{C}}_{12}}$ are liquid alkane which is used as a petroleum ether (used in dry cleaning and solvent for rubber) and petrol (used as fuel in motors and car).
Alkanes having carbon ${{\text{C}}_{12}}\text{-}{{\text{C}}_{16}}$ are liquid alkane, mainly used in the form of kerosene oil and alkane having carbon ${{\text{C}}_{16}}\text{-}{{\text{C}}_{18}}$ used in the formation of diesel oil or gas oil.

Complete answer:
LPG is the mixture of liquid propane$\text{(}{{\text{C}}_{3}}{{\text{H}}_{8}})$ and isobutene$\text{(}{{\text{C}}_{4}}{{\text{H}}_{10}})$. This is a strong ordered flammable mixture that burns with very hot flame. This gaseous mixture is also used in blowlamps and gas lighter. The boiling point of this gaseous mixture is less than room temperature, so it will evaporate quickly at the room temperature. This is the reason LPG is usually supplied under higher pressure in the steel vessels.
LPG burns more effectively than natural gas (a mixture of methane, ethane, propane and trace of hydrogen nitrogen and carbon dioxide) and releases greenhouse gases and small amounts of carbon dioxide.

Note:
LPG gas is mainly manufactured by wet natural gases coming out from the ground and refining petroleum (crude oil).
LPG contains $80\%$ butane and $20\%$ propane, and this gas has been used as a fuel in aerosols and refrigerators.