JEE Main 2025 — Hydrocarbons Question with Solution

The compound given is hex-1,3-dien-5-yne structure is

A doble bond has one $\pi$ bond and one sigma bond.

A triple bond has one sigma bond and two $\pi$ bonds.

For the one triple bond, number of $\pi$ bonds = 2

For one double bond, number of $\pi$ bond = 1

For two double bonds, number of $\pi$ bonds = 2

So, total number of $\pi$ bonds = 2 + 2 = 4

For sigma bonds, count all carbon - carbon bonds and carbon - hydrogen bonds except the $\pi$ bonds in double bonds and triple bond.

The total number of sigma bonds = 11

So, total number of bonds:

$\sigma =11$

$\pi =4$

Sum of $\sigma$ and $\pi$ bonds

$=11+4=15$