#HCN

Nomenclature, Structure and Preparation of Aldehydes and Ketones

Arrange in increasing order of reactivity with HCN: CH₃CHO, CH₃COCH₃, C₆H₅CHO.

Reactivity with HCN decreases with steric hindrance and increases with electrophilicity: CH₃COCH₃ (ketone) < C₆H₅CHO (aromatic aldehyde) < CH₃CHO (aliphatic aldehyde).

Ref: NCERT Class 12 Chemistry > Chapter 12: Aldehydes, Ketones and Carboxylic Acids > Topic: Nomenclature, Structure and Preparation of Aldehydes and Ketones

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Relationship Between Kp Kc and Factors Affecting Equilibrium - Le Chatelier

The Ka of HCN is 6.2 × 10⁻¹⁰ . What is the Kb of CN- at 298 K?

Kw = Ka × Kb = 1.0 × 10⁻¹⁴ , Kb = (1.0 × 10⁻¹⁴/6.2 × 10⁻¹⁰) ≈ 1.61 × 10⁻⁵ .

Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Relationship Between Kp Kc and Factors Affecting Equilibrium - Le Chatelier

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Physical Equilibrium - Solid-Liquid Gas-Liquid and Henry's Law

The Ka of HCN is 4.9 × 10⁻¹⁰ . What is Kb of CN- at 298 K?

Kw = Ka × Kb = 1.0 × 10⁻¹⁴ , so Kb = (Kw/Ka) = (1.0 × 10⁻¹⁴/4.9 × 10⁻¹⁰) ≈ 2.04 × 10⁻⁵ .

Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Physical Equilibrium - Solid-Liquid Gas-Liquid and Henry's Law

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Valence Bond Theory and Hybridisation - sp sp2 sp3 dsp2

The hybridization of carbon in HCN is:

In HCN , carbon has 2 bonding domains (1 triple bond, 1 single bond), requiring sp hybridization, forming a linear shape.

Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Valence Bond Theory and Hybridisation - sp sp2 sp3 dsp2

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