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Which of the following reactions is not an example for nucleophilic addition-elimination reaction?

NEET UG 2022 — Chemistry Organic Chemistry

2022mcqmedium

Which of the following reactions is not an example for nucleophilic addition-elimination reaction?

Official previous-year question

Held on 30 Apr 2022 · Verified 9 Jul 2026.

Options

  1. A

    CH3CHO+NaHSO3⇌CH3−C∣H OH∣−OSO2Na\mathrm{CH}_3 \mathrm{CHO}+\mathrm{NaHSO}_3 \rightleftharpoons \mathrm{CH}_3-\stackrel{\huge \mathrm{~OH} \atop |}{\underset{| \atop \huge \mathrm{H}}{\mathrm{C}}}-\mathrm{OSO}_2 \mathrm{Na}CH3​CHO+NaHSO3​⇌CH3​−H∣​C​∣ OH​​−OSO2​Na

  2. B

    CH3CHO+NH2OH⇌CH3CH=N−OH+H2O\mathrm{CH}_3 \mathrm{CHO}+\mathrm{NH}_2 \mathrm{OH} \rightleftharpoons \mathrm{CH}_3 \mathrm{CH}=\mathrm{N}-\mathrm{OH}+\mathrm{H}_2 \mathrm{O}CH3​CHO+NH2​OH⇌CH3​CH=N−OH+H2​O

  3. C

    CH3CHO+C6H5NHNH2⇌CH3CH=N−NHC6H5+H2O\mathrm{CH}_3 \mathrm{CHO}+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NHNH}_2 \rightleftharpoons \mathrm{CH}_3 \mathrm{CH}=\mathrm{N}-\mathrm{NHC}_6 \mathrm{H}_5+\mathrm{H}_2 \mathrm{O}CH3​CHO+C6​H5​NHNH2​⇌CH3​CH=N−NHC6​H5​+H2​O

  4. D

    CH3CHO+NH3⇌CH3CH=NH+H2O\mathrm{CH}_3 \mathrm{CHO}+\mathrm{NH}_3 \rightleftharpoons \mathrm{CH}_3 \mathrm{CH}=\mathrm{NH}+\mathrm{H}_2 \mathrm{O}CH3​CHO+NH3​⇌CH3​CH=NH+H2​O

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