Question

The general formula of alkynes is ____

Answer 1

Hint: We have to recall that alkynes are non-cyclic unsaturated hydrocarbons that have carbon-carbon triple bonds. We have to know that in alkynes, the atoms of carbon are $sp$ hybridized. The reactivity of alkynes is very high. From atoms of carbon, we can predict the general formula of alkynes.

Complete answer:
We know that alkynes are non-cyclic unsaturated hydrocarbons that have carbon-carbon triple bonds. We have to know that in alkynes, the atoms of carbon are $sp$ hybridized and the shape of alkynes is linear. Due to linear structure, the members of alkynes do not exhibit geometrical isomerism. Molecules that contain a triple bond between two atoms of carbon are known as alkynes. The triple bond consists of one $\sigma $ bond and two $\pi $ bonds. As in alkenes, the $\pi $ bonds comprise parts of expanded electron density lying corresponding to the axis of the carbon-carbon bond. Carbon-carbon triple bonds are strong bonds, yet reactions do happen that break the π bonds to frame stronger σ bonds.
We can write the general formula as ${C_n}{H_{2n - 2}}$.

Additional information:
The alkynes are commonly known as acetylenes.
The name acetylene chemically denotes ethyne.
Alkynes are hydrophobic in nature
Terminal alkynes and internal alkynes are two kinds of alkynes.

Note:
 We have to remember that terminal alkyne forms white precipitate of silver alkyonides when they react with Tollen’s reagent. Similar to alkenes, alkynes also go through electrophilic addition reactions. One should not get confused with alkanes, alkenes, and alkynes. Alkanes are compounds that contain carbon-carbon single bond and alkenes are compounds that contain carbon-carbon double bond.