Determine the exact number of (sigma) and (pi) bonds present in one molecule of but-1-en-3-yne. — Hydrocarbons Chemistry Question

💡 Solution & Explanation

The structure of but-1-en-3-yne is $CH_2=CH-C\equiv CH$. Expanding the bonds: there are 4 $C-H$ single bonds ($4\sigma$), 1 $C=C$ double bond ($1\sigma, 1\pi$), 1 $C-C$ single bond ($1\sigma$), and 1 $C\equiv C$ triple bond ($1\sigma, 2\pi$). Total $\sigma$ bonds = $4 + 1 + 1 + 1 = 7$. Total $\pi$ bonds = $1 + 2 = 3$.