Amines: nomenclature, classification, structure, preparation
- Predict the major product 'P' in the following sequence of reactions -(i) HBr, benzoyl peroxide; (ii) KCN; (iii) Na(Hg)/C_2H_5OH -> P (Major), starting from 1-methylcyclopentene Answer: 1. methylcyclopentane with CH₂NH₂ (see figure) Key idea: HBr with peroxide adds anti-Markovnikov, KCN replaces Br by CN, and Na(Hg)/... 1
- Identify the major product C formed in the following reaction sequence :CH_3-CH_2-CH_2-I NaCN A [Partial hydrolysis]OH^- B [Br_2]NaOH C (major) Answer: 2. propylamine Key idea: follow each step. CH₃CH₂CH₂I+NaCN→ CH₃CH₂CH₂CN (A, butanenitrile). Partial hydrolysis with OH^- gives CH₃CH... 1
- Given below are two statements:Statement I : Aniline does not undergo Friedel-Crafts alkylation reaction.Statement II : Aniline cannot be prepared through Gabriel synthesis.In the light of the above statements, choose the correct answer from the opti… Answer: 2. Both Statement I and Statement II are true. Key idea: the -NH₂ group of aniline is basic and reacts with Lewis acids; Gabriel syn... 1
- Which of the following reactions will NOT give primary amine as the product? Answer: 4. mathrmCH₃NC xrightarrow[(ii)\ H₃O^(oplus)](i)\ LiAlH₄ Product Key idea: Find which reaction does not give R-NH₂ . 1: LiAlH₄ reduc... 1
- Some tranquilizers are listed below. Which one from the following belongs to barbiturates? Answer: 1. Veronal Key idea: Barbiturates are derivatives of barbituric acid. Veronal (barbital) is a barbiturate (others: luminal, seconal)... 1
- Which of the following is a cationic detergent ? Answer: 3. Cetyltrimethyl ammonium bromide Cationic detergents have a positively charged head group, usually a quaternary ammonium salt. Cet... 1
- Which of the following reactions is appropriate for converting acetamide to methanamine ? Answer: 1. Hoffmann hypobromamide reaction Key idea: Hoffmann bromamide reaction removes one carbon from an amide to give a primary amine. C... 1