Question

In the following questions a statement of Assertion $\left(A\right)$ followed by a statement of Reason $\left(R\right)$ is given.

Choose the correct answer out of the following choice.

Assertion $\left(A\right)$: Aniline on reaction with $NaN{O}_2/HCl$ at $0°C$ followed by coupling with $\beta -\text{napthol}$ gives a intense red coloured precipitate.
Reason (R): The colour of the compound formed in the reaction of aniline with $NaN{O}_2/HCl$ at $0°C$ followed by coupling with $\beta -\text{napthol}$ is due to the extended conjugation.

• A. Both Assertion and Reason are false
• B. Assertion is true but Reason is false
• C. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
• D. Both Assertion and Reason are true and Reason is the correct explanation of Assertion

Answer 1

The correct option is D Both Assertion and Reason are true and Reason is the correct explanation of Assertion

The reaction of aniline with $NaN{O}_2/HClat{0}^{\circ }C$ followed by coupling reaction with $\beta -\text{napthol}$ forms an intense red colour dye as shown below.



The colour aries because of the extended conjugation of azo group with the benzene in the compund.

Thus, the assertion is true but the reason is correct explanation for the colour of the compound.

Hence, option (a) is correct.