Q.

Assertion: Alkenes and alkynes burn with a sooty flame whereas alkanes burn with a blue flame.

Reason: The percentage of carbon is more in alkene and alkynes.

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a

Both assertion and reason are correct, and the reason is the correct explanation for assertion.

b

Assertion is true but the reason is false

c

Bothe assertion and reason are incorrect.

d

Both assertion and reason are correct, and the reason is not the correct explanation for assertion.

answer is A.

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Detailed Solution

Both assertion and reason are correct, and the reason is the correct explanation for assertion.

In the case of alkene and alkyne, a large amount of carbon does not get oxidized completely giving rise to a sooty flame.

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