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Passage-5 When an primary aromatic ami...

Passage-5
When an primary aromatic amine is treated with `NaNO_2 + HCI` at `0^(@) - 5^(@) C`, a diazonium salt is formed and the reaction is called diazo reaction. In this reaction mineral acid must be added to prevent the coupling reaction of diazonium salt with excess of aryl amine. Diazonium salt is highly useful in the synthesis of number of coloured dyes.
For the following diazonium ion the decreasing order of reactivity of these ion in azo-coupling reaction :

A

Q gt S gt R gt P

B

Q gt S gt P gt R

C

P gt Q gt R gt S

D

S gt R gt Q gt P

Text Solution

Verified by Experts

The correct Answer is:
B
Electron withdrawing groups increases reactivity of diazonium salt.
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