Question

IUPAC name of the following is $CH_2=CH-CH_2CH_2-C \equiv CH$

• A. $1,5$-hexenyne
• B. $1$ -hexene-$5$-yne
• C. $1$-hexyne-$5$-ene
• D. $1,5$-hexynene

Answer 1

Answer: (B)

$1$ -hexene-$5$-yne

Answer 2

The double bond gets priority over triple bond. So, the IUPAC name of $_{CH_2}^{ \, \, \, \, 1} \, _{=CH}^{ \, \, \, \, 2} \, _{-CH_2}^{ \, \, \, \, 3} \, _{-CH_2}^{ \, \, \, \, 4} \, _{-C}^{ \, \, \, \, 5} \, _{\equiv CH}^{ \, \, \, \, 6}$ hex-l-en-5-yne or l-hexene-5-yne