Identify the final product [D] obtained in the following sequence of reactions. mathrmCH₃CHO xrightarrow[ii)\ H₃O^+]i)\ LiAlH₄ [A] xrightarrow[Δ]H₂SO₄ [B] xrightarrowHBr [C] , then [C] + bromobenzene xrightarrowNa/dry\ ether [D] 1. mathrmHCequiv C^(ominus)Na^+ 2. ethylbenzene (structure) 3. biphenyl (structure) 4. C ₄ H ₁₀

Answer: 2. ethylbenzene (structure) Key idea: Follow the sequence, ending with a Wurtz-Fittig reaction. CH₃CHO with LiAlH₄ gives ethanol [A]. H₂SO₄ , heat: dehydration gives ethene [B]. HBr adds to give bromoethane [C]. C₂H₅Br + bromobenzene + Na in dry ether gives ethylbenzene [D] (Wurtz-Fittig). Option 2.

Topic: Alkynes: acidic character and addition reactions· Hydrocarbons

Identify the final product [D] obtained in the following sequence of reactions.CH_3CHO [ii)\ H_3O^+]i)\ LiAlH_4 [A] [Δ]H_2SO_4 [B] HBr [C], then [C] + bromobenzene Na/dry\ ether [D]

Identify the final product [D] obtained in the following sequence of reactions.

\(\mathrm{CH_3CHO \xrightarrow[ii)\ H_3O^+]{i)\ LiAlH_4} [A] \xrightarrow[\Delta]{H_2SO_4} [B] \xrightarrow{HBr} [C]}\), then [C] + bromobenzene \(\xrightarrow{Na/dry\ ether}\) [D]

reaction sequence and options (some are structures)

1. \(\mathrm{HC\equiv C^{\ominus}Na^+}\)

2. ethylbenzene (structure)

3. biphenyl (structure)

4. C\(_4\)H\(_{10}\)

Doubtly Asked 30 Oct 2026 NEET UG 2023 Practice test neet Save WhatsApp Report

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Answer: 2. ethylbenzene (structure)

Key idea: Follow the sequence, ending with a Wurtz-Fittig reaction.

\(\mathrm{CH_3CHO}\) with \(\mathrm{LiAlH_4}\) gives ethanol [A].
\(\mathrm{H_2SO_4}\), heat: dehydration gives ethene [B].
HBr adds to give bromoethane [C].
\(\mathrm{C_2H_5Br}\) + bromobenzene + Na in dry ether gives ethylbenzene [D] (Wurtz-Fittig).

Option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Identify the final product [D] obtained in the following sequence of reactions.CH_3CHO [ii)\ H_3O^+]i)\ LiAlH_4 [A] [Δ]H_2SO_4 [B] HBr [C], then [C] + bromobenzene Na/dry\ ether [D]

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