The answer to this question is option no. d that is π bonds and alkanes.
What are hydrocarbons?
An organic chemical molecule known as a hydrocarbon is made up only of the atoms of hydrogen and carbon. Natural substances called hydrocarbons are the building blocks of coal, natural gas, crude oil, and other significant energy sources.
The burning of hydrocarbons releases carbon dioxide, water, and heat. They are very combustible. As a result, hydrocarbons constitute a very efficient fuel source.
In chemistry, pi bonds (sometimes spelled "pi bonds") are covalent chemical bonds in which two orbital lobes on one atom overlap laterally with two orbital lobes on another element.
Alkanes are saturated hydrocarbons because they only have one bond between the carbon atoms. Alkenes have at least one double bond between carbon atoms.
Alkynes have one or more triple bonds between carbon atoms. Unsaturated hydrocarbons are the name given to alkenes and alkynes.
