PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Chemistry

Following type of nom-ionic detergents are present in liquid detergents, emulsifying agents and wetting agents. Label the hydrophilic and hydrophobic parts in the molecule. Identify the functional group (s) present in the molecule.

Why do soaps not work in hard water?

Can you use soaps and synthetic detergents to check the hardness of water?

Explain the cleansing action of soaps.

Predict the products formed when cyclohexanecarbaldehyde reacts with the following reagents.

Zinc amalgam and dilute hydrochloric acid

How will you bring about the following conversion in not more than two steps?

Propanone to Propene

How will you bring about the following conversion in not more than two steps?

Benzoic acid to m-Nitrobenzyl alcohol

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?