Assertion : $P h B r$ is less reactive than $C_{2} H_{5} B r$ towards $S_{N}$ reactions. Reason: The forces of attraction between $R X$ and $H_{2} O$ molecules are weaker than those present between the molecules of $R X$ and water separately.

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 are correct

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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
Correct explanation:
Due to resonance, $(C - B r)$ bond in $P h B r$ is a little stronger than $(C - B r)$ bond in $C_{2} H_{5} B r$

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Similar questions

Assertion (A) o-nitrophenol is less soluble in water than the m- and p-isomers.
Reason (R) m and p-nitrophenols exist as associated molecules.
(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) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(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.

Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

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

Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(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.

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Assertion :PhBr is less reactive than C2H5Br towards SN reactions. Reason: The forces of attraction between RX and H2O molecules are weaker than those present between the molecules of RX and water separately.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionCorrect explanation:Due to resonance, (C−Br) bond in PhBr is a little stronger than (C−Br) bond in C2H5Br

Assertion : $P h B r$ is less reactive than $C_{2} H_{5} B r$ towards $S_{N}$ reactions. Reason: The forces of attraction between $R X$ and $H_{2} O$ molecules are weaker than those present between the molecules of $R X$ and water separately.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Correct explanation:
Due to resonance, $(C - B r)$ bond in $P h B r$ is a little stronger than $(C - B r)$ bond in $C_{2} H_{5} B r$