Question

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

• A. Butene -2- yne
• B. But-2-yne-3-ene
• C. 3 - Butane - 1 - ene
• D. 1 - Butene - 3- yne

Answer 1

The correct option is D 1 - Butene - 3- yne

$\stackrel{4}{C}H\equiv \stackrel{3}{C}-\stackrel{2}{C}H=\stackrel{1}{C}{H}_2$.

As triple bond is present at carbon no. 3 and double bond is present at carbon no. 1 so IUPAC name of compound is 1 - butene - 3- yne. In numbering double bond is given preference if from both side alkene and alkyne functional group are present at same numbers.