Question

Which of the following is least reactive towards hydrogenation?

• A. $C{H}_3-C\equiv C-C{H}_3$
• B. $C{H}_3-C\equiv CH$
• C. $HC\equiv CH$
• D. $H_{2}C=C{H}_2$

Answer 1

The correct option is D $H_{2}C=C{H}_2$

Alkenes are less reactive than alkynes towards hydrogenation because alkynes are less sterically hindered in comparison to alkenes. Hence, the correct option will be option (d).