(A) : Order of reaction is related to molecularity of reaction.
(R) : Molecularity of reaction can be fractional.

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Both (A) and (R) are correct and (R) is the correct explanation of (A).

Both (A) and (R) are correct but (R) is not the correct explanation of (A).

(A) is correct but (R) is wrong.

(A) and (R) both are wrong.

answer is C.

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Detailed Solution

Assertion is true because for simple reaction, molecularity = order the reaction.
Reason is also false but Reason is not the correct explanation of Assertion because the order can be zero and fractional but molecularity can't.

Therefore, the correct option is (D).

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