Question

Modify the given structure to show the product of the hydrogenation of cis-2-pentene. Include all hydrogen atoms. You may need to change bonds, add atoms, or remove atoms.

Answer 1

Concepts and reason

In alkenes, the addition of hydrogen across the double bond in the presence of a catalyst forms alkane product, which is represented as a hydrogenation reaction. It is an exothermic reaction in which syn addition takes place.

Fundamentals

In hydrogenation reaction, the hydrogen atom cleaves and gets attached to the metal surface in the presence of a catalyst.

The alkene is absorbed by the metal surface. One of the hydrogen atoms is transferred to alkene, which forms carbon – hydrogen bond and the second hydrogen atom is transferred to alkene to form another carbon – hydrogen bond.

This hydrogenation reaction undergoes syn addition.

Example:

Ans:

The hydrogenation product of the given alkene in different forms is given below.