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Reaction with Metals

Assertion A :...

Question

Assertion (A) : Benzene does not decolourize $B r_{2}$ water.
Reason (R) : Benzene is stabilized by resonance due to delocalization of $π$ -electrons.

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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B

Both Assertion and Reason are true and Reason is not correct explanation of Assertion

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C

Assertion is true but Reason is false

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D

Both Assertion and Reason are false

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion
This decolourising of bromine water is a test for unsaturated compounds.

Due to delocalisation of pi electrons benzene doesnt give test of unsaturation and doesnt undergo addition reaction. (As aromatic system is most stable)

Option A is correct.

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Similar questions

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c)If assertion is true but reason is false.
(d)If assertion is false but reason is true.

Assertion: Phenol is more reactive than benzene towards electrophilic substitution reaction.
Reason : In the case of phenol, the intermediate phenoxide is more resonance stabilized.

Q. (i)
Assertion: A circle is not a rectilinear figure.
Reason: A figure formed by straight lines only is called a rectilinear figure.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
(ii)
Assertion: All right angles are equal to one another.
Reason: A unique line passes through a single point.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

C O_{2}

is a resonance stabilized molecule.
Reason: The bond length of

C - O

C O_{2}

is in between the lengths of a single and a double bond.

Q. Assertion [A]: Deforestation is one of the main factors contributing to global warming.
Reason [R]: Besides

C O_{2}

, methane and CFCs are also greenhouse gases.

Q. Assertion: Every parallelogram is a rectangle.
Reason: The angle bisectors of a parallelogram form a rectangle.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

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