Let be the number of sigma () bonds and be the number of pi () bonds in 1-butene-3-yne (but-1-en-3-y — IUPAC and Nomenclature Chemistry Question
Question
Let $x$ be the number of sigma ($\sigma$) bonds and $y$ be the number of pi ($\pi$) bonds in 1-butene-3-yne (but-1-en-3-yne). What is the value of $x - y$?
Answer: 4
💡 Solution & Explanation
The formula is $CH_2=CH-C \equiv CH$. It contains 3 C-C bonds and 4 C-H bonds, yielding a total of 7 $\sigma$ bonds ($x=7$). The molecule has 1 double bond and 1 triple bond, yielding a total of 3 $\pi$ bonds ($y=3$). $x - y = 7 - 3 = 4$.
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