Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

How the following conversion can be carried out?

Ethyl chloride to propanoic acid.

C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH₃–Cl.

S_N1 reactions are accompanied by racemization in optically active alkyl halides.

Orange colour of `Cr_2O_7^(2–)` ion changes to yellow when treated with an alkali. Why?

Write one difference in Homogeneous catalysis and Heterogeneous catalysis

Given reasons: S_N1 reactions are accompanied by racemization in optically active alkyl halides.

What type of azeotrope is formed by positive deviation from Raoult’s law?

Which would undergo S_N2 reaction faster in the following pair and why ?

CH₃ – CH₂ ​– Br and CH₃ ​– CH₂ ​– I

What is meant by negative deviation from Raoult's law? Give an example. What is the sign of ∆_mixH for negative deviation?

Complete the following chemical equation:

\[\ce{Ca3P2 + H2O ->}\]

Which alkyl halide from the following pair is chiral and undergoes faster S_N2 reaction?

Out of S_N1 and S_N2, which reaction occurs with

(a) Inversion of configuration
(b) Racemisation

Some liquids on mixing form 'azeotropes'. What are 'azeotropes'?

What is the significance of number of 6,6 in the polymer nylon-6,6?

State Raoult’s law for a solution containing volatile components. Write two characteristics of the solution which obey Raoult’s law at all concentrations. 

Write the structures of monomers used the following polymers: 
Nylon - 6, 6

Write the equation involved in Friedal-Crafts Alkylation of Phenol 

Answer the following question.
Write one stereochemical difference between S_N1 and S_N2 reactions.

How many tetrahedral voids can exist per unit cell in a hexagonal close packing sphere?