1. 10 σ bonds and 3 π bonds 2. 8 σ bonds and 5 π bonds 3. 11 σ bonds and 2 π bonds 4. 13 σ bonds and no π bond

Answer: 1. 10 σ bonds and 3 π bonds Count every bond in pent-2-en-4-yne, CH₃-CH=CH-Cequiv CH . A single bond is one σ ; a double bond is 1 σ + 1 π ; a triple bond is 1 σ + 2 π . C-C σ bonds: 4 (including the σ of the double and triple bonds) C-H σ bonds: 3 + 1 + 1 + 1 = 6 Total σ = 10 π bonds: 1 (double) + 2 (triple) = 3 So the molecule has 10 σ and 3 π bonds, option (1).

Topic: Tetravalency of carbon, hybridization and shapes· Some Basic Principles of Organic Chemistry

The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is :

1. 10 \(\sigma\) bonds and 3 \(\pi\) bonds

2. 8 \(\sigma\) bonds and 5 \(\pi\) bonds

3. 11 \(\sigma\) bonds and 2 \(\pi\) bonds

4. 13 \(\sigma\) bonds and no \(\pi\) bond

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Answer: 1. 10 \(\sigma\) bonds and 3 \(\pi\) bonds

Count every bond in pent-2-en-4-yne, \(\mathrm{CH_3-CH=CH-C\equiv CH}\). A single bond is one \(\sigma\); a double bond is 1 \(\sigma\) + 1 \(\pi\); a triple bond is 1 \(\sigma\) + 2 \(\pi\).

C-C \(\sigma\) bonds: 4 (including the \(\sigma\) of the double and triple bonds)
C-H \(\sigma\) bonds: 3 + 1 + 1 + 1 = 6
Total \(\sigma\) = 10
\(\pi\) bonds: 1 (double) + 2 (triple) = 3

So the molecule has 10 \(\sigma\) and 3 \(\pi\) bonds, option (1).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is :

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