Question

${{C}_{n}}{{H}_{2n-2}}$ is the formula for

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Hint: Hydrocarbons which have triple bonds in them have the formula of type ${{C}_{n}}{{H}_{2n-2}}$.
There are three types of hydrocarbons (molecules made up of carbon and hydrogen and they are covalently bonded):
Alkane
Alkene
Alkyne

Alkanes are the type of hydrocarbons that have a single bond between the molecules. General molecular formula of alkanes is${{C}_{n}}~{{H}_{2n+2}}~$ in which n stands out for the number of carbon atoms. They only have sigma bonds in their compounds. Simplest example of alkane is ethane which has a molecular formula ${{C}_{2}}{{H}_{6}}$.
Alkenes are the type of hydrocarbons that have double bonds in their compounds. They are unsaturated. General formula of the compounds of alkene are ${{C}_{n}}{{H}_{2n}}$ in which n stands for number of carbon atoms. Alkenes have 2 hydrogen less than corresponding alkanes. They have sigma as well as pi bonds in their compounds. Simplest example of alkene isothere which has a chemical formula ${{C}_{2}}{{H}_{4}}$ .
Alkynes are the type of hydrocarbons that are highly unsaturated. The general formula of the alkynes is${{C}_{n}}{{H}_{2n-2}}$. The compounds of alkynes consist of 2 pi bonds.
Alkynes have 4 hydrogen less than the corresponding alkane and 2 hydrogen less than corresponding alkene. They have 2 pi bonds in their compounds. Simplest example of alkyne is ethyne which has a chemical formula of ${{C}_{2}}{{H}_{2}}$.
Note: Alkynes are the type of hydrocarbons that have triple bonds in their compounds. They too are unsaturated. They can be represented by the general formula ${{C}_{n}}{{H}_{2n-2}}$ in which n stands for number of carbon atoms.