Chemistry - Halogen Derivative Question with Solution | TestHub

Mesityl oxide is an $\alpha ,\beta$-unsaturated ketone obtained by the aldol condensation of two molecules of acetone followed by dehydration.

The reaction proceeds as follows:

$2{\mathrm{CH}}_3-\mathrm{CO}-{\mathrm{CH}}_3\stackrel{\mathrm{Ba}(\mathrm{OH}{)}_2}{\to }{\left({\mathrm{CH}}_3\right)}_2\mathrm{C}(\mathrm{OH})-{\mathrm{CH}}_2-\mathrm{CO}-{\mathrm{CH}}_3\stackrel{\Delta ,-{\mathrm{H}}_2\mathrm{O}}{\to }{\left({\mathrm{CH}}_3\right)}_2\mathrm{C}=\mathrm{CH}-\mathrm{CO}-{\mathrm{CH}}_3$

Thus, the structural formula of mesityl oxide is ${\left({\mathrm{CH}}_3\right)}_2\mathrm{C}=\mathrm{CH}-\mathrm{CO}-{\mathrm{CH}}_3$. Its IUPAC name is 4-methylpent-3-en-2-one.

Answer: ${\left({\mathrm{CH}}_3\right)}_2\mathrm{C}=\mathrm{CH}-\mathrm{CO}-{\mathrm{CH}}_3$