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

Write the mechanism of acid-catalysed dehydration of ethanol to yield ethene.

Draw structure of the following derivative.

The ethylene ketal of hexan-3-one 

Draw the structure of the given derivative.

The ethylene ketal of hexan-3-one

Write the mechanism of acid dehydration of ethanol to yield ethene. 

Give an example of the reaction in the following case.

Oxime

Give an example of the reaction in the following case.

Imine

Write the mechanism of acid-catalysed dehydration of ethanol to yield ethene

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.

Why is bithional added to soap?

Give reasons for the following:

(i) Bond enthalpy of F₂ is lower than that of Cl₂.

(ii) PH₃ has lower boiling point than NH₃.

How will you bring about the following conversions?

Propanone to propane

Give simple chemical tests to distinguish between the following pairs of compounds:  Benzoic acid and Phenol

State Kohlrausch Law.

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

Write the structural difference between starch and cellulose.

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

Write the chemical reaction involved in Wolff-Kishner reduction.