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Standard XII

Chemistry

Classification

Assertion :In...

Question

Assertion :In nitration $H_{2} {S O}_{4}$ is used as sulphonating agent Reason: Benzene has multicentre $π$ -bonding

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 and Reason is correct

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Solution

The correct option is D Assertion is incorrect and Reason is correct
In nitration benzene (electrophillic aromatic substitution reaction), sulphuric acid is used to produce the electrophile $N O_{2}^{+}$ from nitric acid. Hence, the assertion is incorrect.
Benzene has multi centre pi bonding as the pi electrons are de-localized over six C atoms of the benzene ring. Hence, the reason is correct.

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Similar questions

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

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.

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.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

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Assertion :In nitration H2SO4 is used as sulphonating agent Reason: Benzene has multicentre π-bonding

Assertion :In nitration $H_{2} {S O}_{4}$ is used as sulphonating agent Reason: Benzene has multicentre $π$ -bonding