Assertion :In the above reaction a greater regioselectivity is achieved if disiamylbrorane is used in place of diborane Reason: Bulkiness of disiamyl borane increases the regioselectivity

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In the given reaction a greater regioselectivity is achieved if disiamylbrorane is used in place of diborane.
Bulkiness of disiamyl borane increases the regioselectivity.
More bulky disimyl borane tend to attach selectively to the less sterically hindered terminal carbon of given alkyne.
Hence, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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