Question

IUPAC name of $C{H}_3-CH\left(C{H}_3\right)-C\equiv C-CH\left(C{H}_3\right)-C{H}_3$ is:

• A. 2,5-dimethyl -3-hexyne
• B. 2,5-dimethyl-2-hexyne
• C. 3,5-dimethyl-3-hexyne
• D. 2-pentane

Answer 1

The correct option is A 2,5-dimethyl -3-hexyne

1 2 3 4 5 6
$C{H}_3-CH\left(C{H}_3\right)-C\equiv C-CH\left(C{H}_3\right)-C{H}_3$

The given compound is alkyne as it contains a triple bond. Its parent chain contains 6 carbon atom.

As methyl is present as substituent group at carbon no. 2 and 5 and a triple bond is present at carbon number 3.

So IUPAC name of the compound is 2,5 dimethyl -3-hexyne.