Compound A from the following reaction sequence is
- Benzoic acid
- Salicylic Acid
- Phenol
- Aniline
The Correct Option is D
Solution and Explanation
The given reaction sequence involves the following steps:
1. Step 1 (Bromination): In the presence of bromine (\( \text{Br}_2 \)) and carbon disulfide (\( \text{CS}_2 \)) at low temperature (\( 0-5^\circ \text{C} \)), aniline (\( \text{C}_6\text{H}_5\text{NH}_2 \)) undergoes electrophilic substitution at the para and ortho positions. The product \( \text{A} \) is: \[ \text{A} = \text{2,4,6-tribromoaniline}. \]
2. Step 2 (Diazotization): The tribromoaniline reacts with sodium nitrite (\( \text{NaNO}_2 \)) and hydrochloric acid (\( \text{HCl} \)) to form a diazonium salt \( \text{B} \) (\( \text{C}_6\text{H}_2\text{Br}_3\text{N}_2^+\text{Cl}^- \)).
3. Step 3 (Reduction): The diazonium salt \( \text{B} \) undergoes reduction with hypophosphorous acid (\( \text{H}_3\text{PO}_2 \)) and heat (\( \Delta \)) to produce the final compound \( \text{C} \), which is: \[ \text{C} = \text{2,4,6-tribromobenzene}. \] Since the starting compound is aniline and it undergoes transformation into 2,4,6-tribromobenzene, the answer is: \[ \boxed{\text{Aniline (Option 4)}}. \]
Top Questions on Alcohols, Phenols and Ethers
From the following, how many compounds contain at least one secondary alcohol?
- JEE Main - 2026
- Chemistry
- Alcohols, Phenols and Ethers
- How methanol is prepared industrially? Write the chemical equation.
- KBPE - 2026
- Chemistry
- Alcohols, Phenols and Ethers
Name the products formed when phenol is treated with the following reagents:
(i) Bromine water
(ii) Zinc dust
(iii) Conc. HNO_3- KBPE - 2026
- Chemistry
- Alcohols, Phenols and Ethers
(i) Predict the products A and B in the hydroboration-oxidation reaction.
(ii) Explain the preparation of phenol from cumene.- KBPE - 2026
- Chemistry
- Alcohols, Phenols and Ethers
- Why is Phenol more acidic than alcohols?
- NBSE Class XII - 2026
- Chemistry
- Alcohols, Phenols and Ethers
Questions Asked in JEE Main exam
- Let \( \vec{a} = -\hat{i} + \hat{j} + 2\hat{k} \), \( \vec{b} = \hat{i} - \hat{j} - 3\hat{k} \), \( \vec{c} = \vec{a} \times \vec{b} \) and \( \vec{d} = \vec{c} \times \vec{a} \). Then \( (|\vec{a}|^2 - |\vec{b}|^2) \cdot \vec{d \) is equal to:}
- JEE Main - 2026
- Matrices and Determinants
- A regular hexagon is formed by six wires each of resistance \( r \,\Omega \) and the corners are joined to the centre by wires of same resistance. If the current enters at one corner and leaves at the opposite corner, the equivalent resistance of the hexagon between the two opposite corners will be
- JEE Main - 2026
- Nuclear physics
- If \( \vec{a}, \vec{b}, \vec{c} \) are three vectors such that \[ \vec{a} \times \vec{b} = 2(\vec{a} \times \vec{c}), \] \( |\vec{a}| = 1,\; |\vec{b}| = 4,\; |\vec{c}| = 2 \) and the angle between \( \vec{b} \) and \( \vec{c} \) is \( 60^\circ \), then find \( |\vec{a} \cdot \vec{c}| \):
- JEE Main - 2026
- Vector Algebra
- The time period of a simple harmonic oscillator is \[ T=2\pi\sqrt{\frac{m}{k}}. \] Measured value of mass \(m\) has an accuracy of \(10%\) and time for 50 oscillations of the spring is found to be \(60\,\text{s}\) using a watch of 2 s resolution. Percentage error in determination of spring constant \(k\) is:
- JEE Main - 2026
- Waves and Oscillations
A wire of uniform resistance \(\lambda\) \(\Omega\)/m is bent into a circle of radius r and another piece of wire with length 2r is connected between points A and B (ACB) as shown in figure. The equivalent resistance between points A and B is_______ \(\Omega\).
- JEE Main - 2026
- mechanical properties of solids
Concepts Used:
Alcohols, Phenols, and Ethers
Alcohol is formed when a saturated carbon atom bonds to a hydroxyl (-OH) group. It is an organic compound that contains a hydroxyl functional group attached to a carbon atom.
Phenol is formed when the -OH group replaces the hydrogen atom in benzene. It is an organic compound in which a hydroxyl group directly attaches to an aromatic hydrocarbon.
Ether is formed when oxygen atom bonds to two alkyl or aryl groups. It is an organic compound that has an oxygen atom that is connected to two aryl and alkyl groups.
Read More: Alcohol, Phenol, and Ethers