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In a molecule of acetylene (H-C≡C-H), how many sigma and pi bonds are present?

1. Three sigma bonds and two pi bonds
2. Two sigma bonds and three pi bonds
3. Four sigma bonds and one pi bond
4. One sigma bond and four pi bonds

Correct answer: Three sigma bonds and two pi bonds

Solution

In ethyne (H-C≡C-H), there are 3 sigma (σ) bonds: one between each hydrogen and carbon, and one between the two carbons. The triple bond between the carbons consists of one sigma bond and two pi (π) bonds.

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