Assertion :Rate of nitration is $C_{6} H_{6} ≃ C_{6} D_{6} ≃ C_{6} T_{6}$ Reason: Formation of intermediate is rate determining step in nitration of benzene, not the breaking of $C - H$ or $C - D$ bond.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Nitration of Benzene Ring:
(Refer to Image 1)
Nitronium ion become a good electrophile.
Mechanism:-
(Refer to Image 2)

Here, step $1$ i.e attack on electrophile is the rate determining step, not the breaking of $C - H$ or $C - D$ bond.

Thus, Rate of Nitration is almost equal for $C_{6} H_{6} ≃ C_{6} D_{6} ≃ C_{6} T_{6}$

Thus the Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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Similar questions

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion: Nitrating mixture used for carrying our nitration of benzene consists of

c o n c . H N O_{3} + c o n c . H_{2} S O_{4} .

Reason :In presence of

H_{2} S O_{4}, H N O_{3}

acts as a base and produces

N O_{2}^{+}

ions.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

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Assertion :Rate of nitration is C6H6≃C6D6≃C6T6 Reason: Formation of intermediate is rate determining step in nitration of benzene, not the breaking of C−H or C−D bond.

Assertion :Rate of nitration is $C_{6} H_{6} ≃ C_{6} D_{6} ≃ C_{6} T_{6}$ Reason: Formation of intermediate is rate determining step in nitration of benzene, not the breaking of $C - H$ or $C - D$ bond.