137 public questions tagged with this topic.
Octatriyne (CH≡C-C≡C-C≡C-CH₂-CH₃) has three triple bonds, giving three degrees of unsaturation, fitting C₈H₁₂.
Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Aromatic Hydrocarbons - Structure of Benzene and Resonance
Benzene has a planar hexagonal ring with sp2 hybridized carbons, resulting in bond angles of 120°.
Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Aromatic Hydrocarbons - Structure of Benzene and Resonance
Butane (C₄H₁₀), a saturated alkane, has 10 hydrogens, the maximum for 4 carbons, compared to unsaturated hydrocarbons like butene.
Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Aromatic Hydrocarbons - Electrophilic Substitution Reactions
Alkanes are saturated hydrocarbons with single bonds, and their general formula is CnH₂n+2, where n is the number of carbon atoms.
Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Alkanes - Nomenclature Isomerism Preparation - Wurtz Kolbe
CH₂=CHC≡CH fits C₅H₆. The fourth carbon (C≡) is sp, with a 180° angle.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Qualitative and Quantitative Analysis - Lassaigne Test and Estimation
Molar mass of AgCl = 143.5 g/mol, Cl = 35.5 g/mol. Mass of Cl = (35.5/143.5) × 0.235 = 0.058 g. Percentage = (0.058/0.2) × 100 = 29%.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Qualitative and Quantitative Analysis - Lassaigne Test and Estimation
Molar mass of AgCl = 143.5 g/mol, Cl = 35.5 g/mol. Mass of Cl = (35.5/143.5) × 0.287 = 0.071 g. Percentage = (0.071/0.18) × 100 ≈ 39.44% ≈ 40%.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Qualitative and Quantitative Analysis - Lassaigne Test and Estimation
In CH₃CH₂CH₂CHO, the carbonyl carbon (C=O) has three sigma bonds and one pi bond, indicating sp² hybridization and a trigonal planar shape.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Qualitative and Quantitative Analysis - Lassaigne Test and Estimation
In the Carius method, sulphur is oxidized to H₂SO₄, which reacts with BaCl₂ to form BaSO₄ for estimation.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Qualitative and Quantitative Analysis - Lassaigne Test and Estimation
Mass of N = (28/22400) × 80 = 0.1 g. Percentage = (0.1/0.32) × 100 = 31.25% ≈ 31%.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Qualitative and Quantitative Analysis - Lassaigne Test and Estimation
Mass of Cl = (35.5/143.5) × 0.431 = 0.1066 g. Percentage = (0.1066/0.22) × 100 = 48.45% ≈ 48%.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Qualitative and Quantitative Analysis - Lassaigne Test and Estimation
Fuming nitric acid (HNO₃) is used in the Carius method to oxidize the compound and convert halogens to their respective acids.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Qualitative and Quantitative Analysis - Lassaigne Test and Estimation
