34 public questions tagged with this topic.
Primary amines like CH₃CH₂NH₂ have two N-H bonds to donate and one lone pair to accept, allowing up to two hydrogen bonds donated, as per the PDF’s solubility.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1
Primary amines like CH₃CH₂CH₂NH₂ have stronger hydrogen bonding than secondary or tertiary amines, leading to a higher boiling point, as per the PDF.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1
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
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
Amines dissolve in water due to hydrogen bonding between N-H bonds or the nitrogen lone pair and water molecules, as per the PDF’s physical properties.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Chemical Reactions - Carbylamine Reaction and General Reactions
Ethylamine (CH₃CH₂NH₂), a primary amine, has two N-H bonds to donate and one lone pair to accept, forming three hydrogen bonds with water, as per the PDF’s solubility discussion.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Chemical Reactions - Carbylamine Reaction and General Reactions
CH₃NH₂ (primary) forms hydrogen bonds, while (CH₃)₃N (tertiary) does not, leading to a higher boiling point for the former, as per the PDF.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Chemical Reactions - Carbylamine Reaction and General Reactions
Guanine pairs with cytosine in DNA via three hydrogen bonds, enhancing stability.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Nucleic Acids - Structure - Nucleotides, Sugars and Base Pairing
The secondary structure (e.g., alpha-helix, beta-sheet) of proteins is stabilized by hydrogen bonds between the backbone atoms.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Proteins - Structure, Classification and Denaturation
Threonine has a hydroxyl group (-OH) in its side chain (-CH(OH)-CH₃), enabling hydrogen bonding.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Proteins - Amino Acids - Essential, Non-Essential and Structure
Ethane-1,2-diol (CH₂OH-CH₂OH) has two -OH groups, leading to more extensive hydrogen bonding than ethanol (CH₃CH₂OH), which has one -OH group, increasing its boiling point.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Preparation of Alcohols - from Alkenes Haloalkanes Carbonyls Grignard
Ethanol (CH₃CH₂OH) forms hydrogen bonds due to the -OH group, requiring more energy to break, whereas methoxymethane (CH₃OCH₃) lacks hydrogen bonding, leading to a lower boiling point.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
