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Question

The product obtained when n-heptane is heated to a temperature of about 773 K under high pressure in the presence of Cr2O3/Al2O3 catalyst is:

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

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.

C7H16n-heptaneCr2O3/Al2O3, 1020 atm−−−−−−−−−−−−−−(773 K)C6H5CH3Methylbenzene(Toluene)

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