JEE Main · 2022 · 29 Jul 2022 · Shift 1 · Compounds Containing Nitrogen

Which among the following represent reagent 'A'?

(A)(see structure)
✓ Correct
(B)(see structure)
(C)(see structure)
(D)(see structure)

Answer: (A)

Solution

The reaction shown is a coupling reaction forming an azo dye. Reagent A must be 2-naphthol (β-naphthol), which couples with diazonium salts at the 1-position (ortho to the -OH group) to form colored azo compounds. This is a classic electrophilic aromatic substitution where the activated naphthalene ring couples with the diazonium ion.

JEE Main · 2022 · 29 Jul 2022 · Shift 1 · Single correct option

Practise more: all JEE Main PYQs on Compounds Containing Nitrogen →

More JEE Main questions on Compounds Containing Nitrogen

A hydrocarbon 'P' $(C_{4} H_{8})$ on reaction with HCl gives an optically active compound 'Q' $(C_{4} H_{9} Cl)$ which on reaction with one mole of ammonia gives compound 'R' …
JEE Main 2026View solution →
An organic compound (P) on treatment with aqueous ammonia under hot condition forms compound (Q) which on heating with $Br_{2}$ and KOH forms compound (R) having molecular formula $C_{7} H_{9} N$ . Names of $P, Q$ and R …
JEE Main 2026View solution →
Consider the following reaction sequence

The percentage of nitrogen in product 'T' formed is _____ %. (Nearest integer)

(Given molar mass in $g mol^{- 1}$ H: 1, C: 12, N: 14, O: 16)
JEE Main 2026View solution →
'A' is a neutral organic compound (M. F : $C_{8} H_{9} ON$ ). On treatment with aqueous $Br_{2} / HO^{(-)}$ , 'A' forms a compound ' B ' which is soluble in dilute acid. ' B ' on treatment with aqueous …
JEE Main 2026View solution →
Consider the above sequence of reactions. The number of bromine atom(s) in the final product (P) will be:

(1) $Br_{2} / FeBr_{3} /Δ$
(2) $Sn / HCl /Δ$
(3) pH neutralisation
(4) $Br_{2} / H_{2} O$
(5) …
JEE Main 2026View solution →
The final product $[B]$ is :
JEE Main 2026View solution →