Question

The IUPAC name of the compound having the formula $CH\equiv C-CH=C{H}_2$ is

• A. $3\text{-butene-}1\text{-yne}$
• B. $\text{but-1-ene-}3\text{-yne}$
• C. $\text{but-}1\text{-yne-}3\text{-yne}$
• D. $1\text{-butyne-}3\text{-ene}$

Answer 1

The correct option is B $\text{but-1-ene-}3\text{-yne}$

Answer: (d)
According to IUPAC nomenclature
If a molecule contains both a double and a triple bond, the carbon chain is numbered so that the first multiple bond gets a lower number. If both bonds can be assigned the same number, then double bond is given preference. The molecule is then named "n-en-n-yne", with the double bond root name preceding the triple bond root name.