JEE MAIN - Chemistry (2025 - 29th January Evening Shift - No. 17)

Total number of sigma (σ) _______ and pi(π) ______ bonds respectively present in hex-1-en-4-yne are:
14 and 3
11 and 3
13 and 3
3 and 13

Explanation

The compound given is hex - 1 - en - 4 - yne

Structure is

JEE Main 2025 (Online) 29th January Evening Shift Chemistry - Hydrocarbons Question 13 English Explanation 1

a double bond has one $\pi$ bond and one sigma bond.

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

So, the number of $\pi$ bonds $=1+2=3$

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

JEE Main 2025 (Online) 29th January Evening Shift Chemistry - Hydrocarbons Question 13 English Explanation 2

The number of sigma bonds = 13

So, total number of bonds $\Rightarrow \sigma=13\quad \pi=3$

Answer : option (C) 13 and 3

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