Question

The IUPAC name of the given compound is ________.

• A. but-3-yne
• B. but-1-ene
• C. but-2-yne
• D. but-1-yne

Answer 1

The correct option is C but-2-yne

The given compound can be numbered as shown below.


$\bullet$ There are four carbon atoms in the parent chain (the longest carbon chain) and hence, the root word is 'but'.

$\bullet$ A triple bond is present between the second and third carbon atoms of the chain. Hence, it is an alkyne and the suffix will be '2-yne'.

Therefore, the IUPAC name of the given compound is but-2-yne.