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Q.
$R - CH = CH_2 + CO + H_2 \xrightarrow[\text{High pressure}]{\text{High temp}} RCH_2CH_2CHO$ The above reaction is
Aldehydes Ketones and Carboxylic Acids
Solution:
when reaction between any alkene and water gas $\left( CO + H _{2}\right)$
is occur at high tempereture and high pressure the product will be an aldehyde and this processis called oxo process.