Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Why is the α-hydrogens of aldehydes and ketones are acidic in nature?

Assertion (A): The final product in Aldol condensation is always α, β-unsaturated carbonyl compound.

Reason (R): α, β-unsaturated carbonyl compounds are stabilised due to conjugation.

Identify A and B:

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

\[\ce{CH3 C(CI) (C2H5)CH2CH3 }\]

Give the structure of the product you would expect when the following alcohol reacts with HCl–ZnCl₂.

2-Methylbutan-2-ol

Give the structure of the product you would expect when the following alcohol reacts with HBr.

Butan-1-ol

Give the structure of the product you would expect when the following alcohol reacts with HBr.

2-Methylbutan-2-ol

Give the structure of the product you would expect when the following alcohol reacts with SOCl₂.

Butan-1-ol

Give the structure of the product you would expect when the following alcohol reacts with SOCl₂.

2-Methylbutan-2-ol

Compare acidity of phenol with that of ethanol.

Define “Molar conductivity”.

State Kohlrausch’s law of independent migration of ions.

The conductivity of 0.20 M solution of KCl at 298 K is 0.025 S cm⁻¹. Calculate its molar conductivity.

Complete the following reactions:

State Kohlrausch Law.

Write the final product(s) in each of the following reactions:

What is the role of sulphur in the vulcanisation of rubber?

The conductivity of 0.001 mol L-1 solution of CH₃COOH is 3.905× 10-5 S cm-1. Calculate its molar conductivity and degree of dissociation (α) Given λ°(H⁺)= 349.6 S cm² mol-1 and λ°(CH₃COO)= 40.9S cm²mol^-1.

Give reasons for the following:

o-nitrophenol is more acidic than o-methoxyphenol.

Draw the structures of the following: H₄P₂O₇ (Pyrophosphoric acid)