Question

The product obtained when n-heptane is heated to a temperature of about 773 K under high pressure in the presence of $C{r}_2{O}_3/A{l}_2{O}_3$ catalyst is:

• A. 1,2-dimethylbenzene
• B. Ethylbenzene
• C. Benzene
• D. Toluene

Answer 1

The correct option is D Toluene

Aromatization: n-Alkanes (C≥6) on heating to 773K at 10-20 atm in presence of oxides of vanadium, molybdenum or chromium supported over alumina get aromatized to benzene and its homologues.

$\underset{\text{n-heptane}}{C_7{H}_{16}}\underset{△\left(773K\right)}{\overset{C{r}_2{O}_3/A{l}_2{O}_3,10-20atm}{\to }}\underset{\text{Methylbenzene(Toluene)}}{C_6{H}_{5}C{H}_3}$