Question
Write a short note on hydrogenation of unsaturated aliphatic hydrocarbons.
✓
Answer
When unsaturated compounds, i.e. alkenes or alkynes, are treated with dihydrogen in the presence of finely divided catalysts (i.e. Pt , Pd or Ni ), alkanes are obtained and the reaction is called hydrogenation reaction. As represented in the following reaction where ethene is converted into ethane.
$
\underset{\text { Ethene }}{eg CH_2}=CH_2+H_2 \xrightarrow{Pt \backslash Pd \backslash Ni} \underset{\text { Ethane }}{CH_3-} CH_3
$
$
\underset{\text { Ethene }}{eg CH_2}=CH_2+H_2 \xrightarrow{Pt \backslash Pd \backslash Ni} \underset{\text { Ethane }}{CH_3-} CH_3
$
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