Assertion :The pre-exponential factor $A$ has the same units for all reactions. Reason: $e^{- E_{a} / R T}$ has no unit.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
Arrenius equation: $k = A . e^{- E_{a} / (R T)}$
here, A has same unit as k and $e^{- E_{a} / (R T)}$ is unit less.

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