#amines

CHEMISTRY

Which of the following amines has a lone pair that participates in resonance?

In aniline ( C₆H₅NH₂ ), the nitrogen lone pair is delocalized into the benzene ring via resonance, unlike aliphatic amines. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Chemical Bonding (Latest NCERT 2026-27), Topic: Hybridization of nitrogen in CH₃NH₂, sp³ hybridization and pyramidal geometry

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CHEMISTRY

Which of the following compounds is an aromatic primary amine?

Aniline ( C₆H₅NH₂ ) is an aromatic primary amine with the amino group directly attached to a benzene ring, distinguishing it from aliphatic amines. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

Which of the following reactions is used to test for primary amines by producing a foul-smelling compound?

The carbylamine reaction ( CHCl₃ + alcoholic KOH ) with primary amines produces isocyanides, which have a foul odor, distinguishing them from other amines.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

Which of the following reactions produces an amine with a tertiary carbon attached to nitrogen?

Reduction of (CH₃)3CNO₂ with H₂/Ni yields (CH₃)3CNH₂ (2-methylpropan-2-amine), where nitrogen is attached to a tertiary carbon (tert-butyl group). This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Chemical Bonding (Latest NCERT 2026-27), Topic: Hybridization of nitrogen in CH₃NH₂, sp³ hybridization and pyramidal geometry

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CHEMISTRY

Which of the following reactions produces an amine with a branched carbon chain?

Reduction of (CH₃)2CHCN with H₂/Ni yields (CH₃)2CHCH₂NH₂ (2-methylpropan-1-amine), a primary amine with a branched isobutyl chain. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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Reaction with Nitrous Acid and Diazonium Salts - Part 2

Which amine has the highest pKb value in aqueous solution?

Higher pKb means weaker base. Aniline (C₆H₅NH₂) has the highest pKb (weakest base) due to resonance, as per the PDF’s basicity section.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 2

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Reaction with Nitrous Acid and Diazonium Salts - Part 2

The weakest base among the following in aqueous solution is:

Aniline (C₆H₅NH₂) is the weakest base due to resonance delocalizing the nitrogen lone pair, reducing basicity, as per the PDF.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 2

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Reaction with Nitrous Acid and Diazonium Salts - Part 2

The reaction of CH₃CH₂NH₂ with HCl produces:

Ethylamine (CH₃CH₂NH₂), a base, reacts with HCl to form ethylammonium chloride (CH₃CH₂NH₃Cl), as per the PDF’s basicity.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 2

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Reaction with Nitrous Acid and Diazonium Salts - Part 1

The weakest base among the following in aqueous solution is:

Aniline (C₆H₅NH₂) is the weakest due to resonance delocalizing the nitrogen lone pair, reducing basicity, as per the PDF.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1

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Reaction with Nitrous Acid and Diazonium Salts - Part 1

The order of basicity in gaseous phase for amines with the same alkyl group is:

In the gaseous phase, basicity increases with more alkyl groups due to electron donation: tertiary > secondary > primary, as per the PDF’s basicity section.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1

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Reaction with Nitrous Acid and Diazonium Salts - Part 1

Which amine’s boiling point is least affected by hydrogen bonding?

Tertiary amines like (CH₃CH₂)₃N lack N-H bonds, so their boiling point depends on van der Waals forces, not hydrogen bonding, as per the PDF’s physical properties.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1

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Reaction with Nitrous Acid and Diazonium Salts - Part 1

The number of hydrogen bonds (CH₃)₂NH can form with water is:

Dimethylamine ((CH₃)₂NH), a secondary amine, has one N-H bond to donate and one lone pair to accept, forming two hydrogen bonds, as per the PDF’s solubility.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1

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