Q49.The correct sequential addition of reagents in the preparation of 3−nitrobenzoic acid from benzene is: JEE Main 2021 (26 Aug Shift 1) JEE Main Previous Year Paper (1) Br2 / AlBr3, HNO3 /H2 SO4, Mg / ether, CO2, H3O+ (2) Br2 / AlBr3, NaCN, H3O+, HNO3 /H2 SO4 (3) Br2 / AlBr3, HNO3 /H2 SO4, NaCN, H3O+ (4) HNO3 /H2 SO4, Br2 / AlBr3, Mg / ether, CO2, H3O+
What This Question Tests
This multi-step synthesis problem requires sequential application of electrophilic aromatic substitution (nitration, bromination) and a Grignard reaction followed by carboxylation, while considering the directing effects of substituents.
Concepts Tested
📚 NCERT Sections This Tests
9.8 — Accomplish The Following Conversions:
Chemistry Class 12 · Chapter 9
9.8 Accomplish the following conversions: (i) Nitrobenzene to benzoic acid (ii) Benzene to m-bromophenol (iii) Benzoic acid to aniline (iv) Aniline to 2,4,6-tribromofluorobenzene (v) Benzyl chloride to 2-phenylethanamine (vi) Chlorobenzene to p-chloroaniline (vii) Aniline to p-bromoaniline (viii) Benzamide to toluene (ix) Aniline to benzyl alcohol.
7.21 — Name The Reagents Used In The Following Reactions:
Chemistry Class 12 · Chapter 7
7.21 Name the reagents used in the following reactions: (i) Oxidation of a primary alcohol to carboxylic acid. (ii) Oxidation of a primary alcohol to aldehyde. (iii) Bromination of phenol to 2,4,6-tribromophenol. (iv) Benzyl alcohol to benzoic acid. (v) Dehydration of propan-2-ol to propene. (vi) Butan-2-one to butan-2-ol.
8.17 — Complete Each Synthesis By Giving Missing Starting Material, Reagent Or Products
Chemistry Class 12 · Chapter 8
8.17 Complete each synthesis by giving missing starting material, reagent or products
📋 Question Details
- Chapter
- Hydrocarbons
- Topic
- Electrophilic Aromatic Substitution
- Year
- 2021
- Shift
- 26 Aug Shift 1
- Q Number
- Q49
- Type
- MCQ
- NCERT Ref
- Class 11 Chemistry Ch 13: Hydrocarbons; Class 12 Chemistry Ch 12: Aldehydes, Ketones and Carboxylic Acids
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