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

Complete the synthesis by giving missing starting material, reagent or product.

\[\ce{CH3COCH2COOC2H5 ->[(i) NaBH4][(ii) H+]}\]

Write the equation involved in the following reaction:

Kolbe’s reaction

While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason.

Give the equation of the following reaction: 

Bromine in CS₂ with phenol.

Name the reagent used in the following reaction:

Bromination of phenol to 2, 4, 6-tribromophenol.

Explain the following with an example.

Kolbe’s reaction.

Identify A, B, C, D, E, R and R¹ in the following:

How will you bring about the following conversion?

Bromomethane to propanone

How will you bring about the following conversion?

1-Chlorobutane to n-octane

Explain why Grignard reagents should be prepared under anhydrous conditions?

Write the structure of the major organic product in the following reaction:

\[\ce{C6H5ONa + C2H5Cl ->}\]

What happens when bromobenzene is treated with Mg in the presence of dry ether?

What happens when methyl bromide is treated with sodium in the presence of dry ether?

How the following conversion can be carried out?

2-Chlorobutane to 3, 4-dimethylhexane

How the following conversion can be carried out?

Chloroethane to butane

Give the disproportionation reaction of H₃PO₃

What is the oxidation state of phosphorus in H₃PO₃?

What is the oxidation state of phosphorus in the following:

PCl₃

What is the oxidation state of phosphorus in the following:

Ca₃P₂

What is the oxidation state of phosphorus in the following:

Na₃PO₄