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Question

Name the hydrocarbon which when heated to a temperature of about 773 K under high pressure in the presence of Cr2O3/Al2O3 catalyst gives benzene.

A
n-pentane
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B
n-hexane
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C
n-pentane
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D
n-octane
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Solution

The correct option is B n-hexane
Aromatization: The n-alkanes with 6 or more C atoms, on heating to 773 K at 10-20 atm pressure in the presence of oxides of V/Mo/Cr get dehydrogenated and cyclised to form benzene and its derivatives.
C6H14n-hexaneCr2O3/Al2O3, 1020 atm−−−−−−−−−−−−−−(773 K)C6H6benzene

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