Match the reagents (List-I) with the products (List-II) obtained from phenol and select the correct option.

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Question

Match the reagents (List-I) with the products (List-II) obtained from phenol and select the correct option.

**List-I (Reagents)**
(A) (i) NaOH, (ii) CO₂, (iii) H⁺
(B) (i) Aqueous NaOH + CHCl₃, (ii) H⁺
(C) Zn dust, Δ
(D) Na₂Cr₂O₇, H₂SO₄

**List-II (Products)**
(I) Benzoquinone
(II) Benzene
(III) Salicylaldehyde
(IV) Salicylic acid

Accepted Answer

The matching is based on the specific chemical reactions of phenol:
1.  **Kolbe's Reaction (A):** Phenol reacts with NaOH to form phenoxide, which then undergoes electrophilic substitution with weak electrophile $CO_2$ followed by acidification to form **Salicylic acid** (2-Hydroxybenzoic acid). [Match: A-IV]
2.  **Reimer-Tiemann Reaction (B):** Treatment of phenol with chloroform ($CHCl_3$) in the presence of aqueous NaOH introduces an aldehyde group at the ortho position, forming **Salicylaldehyde** (2-Hydroxybenzaldehyde). [Match: B-III]
3.  **Reaction with Zinc dust (C):** Phenol is reduced to **Benzene** when heated with zinc dust. [Match: C-II]
4.  **Oxidation (D):** Oxidation of phenol with chromic acid ($Na_2Cr_2O_7 + H_2SO_4$) produces a conjugated diketone known as **Benzoquinone**. [Match: D-I]

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