Science (English Medium) कक्षा १२ - CBSE Important Questions

Out of p-tolualdehyde and p-nitrobenzaldehyde, which one is more reactive towards nucleophilic addition reactions, why?

Write the structure of the product formed when acetone reacts with 2, 4 DNP reagent.

Convert the following:

Benzene to m-nitrobenzaldehyde

Convert the following: 

Bromobenzene to benzoic acid

You are given four organic compounds “A”, “B” , “C” and “D”. The compounds “A”, “B” and “C” form an orange-red precipitate with 2, 4 DNP reagent. Compounds “A” and “B” reduce Tollen’s reagent while compounds “C” and “D” do not. Both “B” and “C” give a yellow precipitate when heated with iodine in the presence of NaOH. Compound “D” gives brisk effervescence with sodium bicarbonate solution. Identify “A”, “B”, “C” and “D” given the number of carbon atoms in three of these carbon compounds is three while one has two carbon atoms. Give an explanation for our answer.

Give the structures of A, B and C in the following reactions:

Write the major products(s) in the following:

Write the structures of main products when benzene diazonium chloride `(C_6H_5N_2^(+)Cl^-)`reacts with the following reagents:

CuCN/KCN

Write the structures of main products when benzene diazonium chloride `(C_6H_5N_2^(+)Cl^-)`reacts with the following reagents:

H₂O

Write the structures of main products when benzene diazonium chloride `(C_6H_5N_2^(+)Cl^-)`reacts with the following reagents:

CH₃CH₂OH

Arrange the following:

Aniline, p-nitroaniline, p-methylaniline - in the increasing order of their basic strength

Why does NH₃ act as a Lewis base?

Give the structures of A, B and C in the following reaction:

Write the IUPAC name of the following compound and classify it as primary, secondary and tertiary amine.

CH₃NHCH(CH₃)₂

Write the IUPAC name of the following compound and classify it as primary, secondary and tertiary amine.

(CH₃CH₂)₂NCH₃

Account for the following:

Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

Arrange the following:

In increasing order of basic strength:

C₆H₅NH₂, C₆H₅NHCH₃, C₆H₅CH₂NH₂

Write a short note on the following:

Hoffmann’s bromamide reaction

Write the structure of 2,4-dinitrochlorobenzene

Give reasons for the following:

CH₃NH₂ is more basis than C₆H₅NH₂.