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

Write equations of the following reactions:
Acetylation of aniline

Write equations of the following reactions:
Coupling reaction

Write equations of the following reactions:
Carbyl amine reaction

Arrange the following:

In increasing order of solubility in water:

C₆H₅NH₂, (C₂H₅)₂NH, C₂H₅NH₂

Account for the following:

Aniline cannot be prepared by the ammonolysis of chlorobenzene under normal conditions.

Give reasons to support the answer:

3-Hydroxy pentan-2-one shows positive Tollen’s test.

Account for the following:

N-ethylethanamine boils at 329.3 K and butanamine boils at 350.8 K, although both are isomeric in nature.

Account for the following:

Acylation of aniline is carried out in the presence of pyridine.

What happens when reaction:

Aniline reacts with chloroform in the presence of alcoholic potassium hydroxide

Arrange the following in the increasing order of their boiling points:

A: Butanamine

B: N, N-Dimethylethanamine

C: N- Etthylethanaminamine

What would be the major product of the following reaction?

\[\ce{C6H5 - CH2 - OC6H5 + HBr -> A + B}\]

Which of the following statements is not correct for amines?

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

Assertion (A): Tertiary amines are more basic than corresponding secondary and primary amines in gaseous state.

Reason (R): Tertiary amines have three alkyl groups which cause +I effect.

Select the most appropriate answer from the options given below:

Give reasons for the following observation:

Aniline is acetylated before nitration reaction.

Give reasons for the following observation:

pK_b of aniline is lower than the m-nitroaniline.

Give reasons for the following observation:

Primary amine on treatment with benzenesulphonyl chloride forms a product which is soluble in NaOH however secondary amine gives product which is insoluble in NaOH.

Give reasons for the following observation:

Aniline does not react with methyl chloride in the presence of anhydrous AlCl₃ catalyst.

An organic compound (A) with molecular formula C₂Cl₃O₂H is obtained when (B) reacts with Red P and Cl₂. The organic compound (B) can be obtained on the reaction of methyl magnesium chloride with dry ice followed by acid hydrolysis.

1. Identify A and B.
2. Write down the reaction for the formation of A from B. What is this reaction called?
3. Give any one method by which organic compound B can be prepared from its corresponding acid chloride.
4. Which will be the more acidic compound (A) or (B)? Why?
5. Write down the reaction to prepare methane from the compound (B).

A primary amine 'A' C₂H₇N reacts with alkyl halide (C₂H₅l) to give secondary amine 'B'. 'B' reacts with C₆H₅SO₂Cl to give a solid 'C' which is insoluble in alkali. Identify 'A', 'B', 'C' and write all the chemical reaction involved.

Among the following, which is the strongest base?