Assertion :The IUPAC name of isoprene is 2-methyl buta-1 ,3-diene. Reason: Isoprene unit is a monomer of natural rubber.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
The IUPAC name of isoprene is 2-methyl buta-1,3-diene is correct. isoprene is common name for 2-methyl buta-1,3-diene.
$C H = C H (C H_{3}) - C H = C H_{2}$
Isoprene
Natural rubber is a polymer.
It consists of isoprene as the monomer.
Both assertion and reason are correct. but Reason is not the correct explanation for Assertion.
So answer is B.

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