Science (English Medium) इयत्ता १२ - CBSE Important Questions for Chemistry

Account for the following:
o-nitrophenol is more steam volatile than p-nitrophenol.

Give simple chemical test to distinguish between Ethanol and Phenol.

Give reasons for the following:

Sulphur in vapour state shows paramagnetic behaviour.

Give reasons for the following:
Ozone is thermodynamically less stable than oxygen.

Write the name of gas released when Cu is added to
dilute HNO₃

Write the name of gas released when Cu is added to
conc. HNO₃

Convert the following: 

Propanenitrile to ethanol.

What happens when reactions:

N-ethylethanamine reacts with benzenesulphonyl chloride.

What happens when reactions:

Benzylchloride is treated with ammonia followed by the reaction with Chloromethane.

The major product of acid catalysed dehydration of 1-methylcyclohexanol is ______.

Given below are two statements labelled as Assertion (A) and Reason (R).

Assertion (A): An ether is more volatile than an alcohol of comparable molecular mass

Reason (R): Ethers are polar in nature.

Select the most appropriate answer from the options given below:

Name the suitable alcohol and reagent, from which 2-Chloro-2-methyl propane can be prepared.

Write the equations for the following reaction:

Tert butyl chloride is treated with sodium ethoxide.

Arrange the following in the increasing order of their property indicated:

4-Nitrobenzoic acid, benzoic acid, 3,4-Dinitrobenzoic acid, 4-Methoxy benzoic acid (Acid strength)

Which of the following reactions are feasible?

Write the equation for the following:

Reaction of chlorobenzene with CH₃Cl/anhyd. AlCl₃.

Which of the following observation is shown by 2-phenyl ethanol with Lucas Reagent?

Anisole undergoes bromination with bromine in ethanoic acid even in the absence of iron (III) bromide catalyst.

Write the name of the reaction, structure and IUPAC name of the product formed when:

\[\ce{CH3CH2CH(CH3)CH(CH3) ONa}\] reacts with \[\ce{C2H5Br}\]

Write the structure of 3-methyl butanal