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Benzene burns with a luminous sooty flam...

Benzene burns with a luminous sooty flame but methane burns with a non-luminous flame with no black smoke. Why ?

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Due to high percentage of carbon, elementary carbon is produced during burning of benzene. As a result , black smoke is formed. The presence of hot carbon particles in the flame makes the flame luminous. In methane, percentage of carbon is low and so no elementary carbon is produced during burning of methane. Thus methane burns with a non-luminous flame with no black smoke.
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