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

What is tincture of iodine? What is its use?

What happens when D-glucose is treated with the following reagent?

HNO₃

Arrange the following:

In decreasing order of the pK_b values:

C₂H₅NH₂, C₆H₅NHCH₃, (C₂H₅)₂NH and C₆H₅NH₂

Arrange the following:

In increasing order of basic strength:

C₆H₅NH₂, C₆H₅N(CH₃)₂, (C₂H₅)₂NH and CH₃NH₂

Arrange the following:

In increasing order of basic strength:

Aniline, p-nitroaniline and p-toluidine

Arrange the following:

In increasing order of basic strength:

C₆H₅NH₂, C₆H₅NHCH₃, C₆H₅CH₂NH₂

Arrange the following:

In decreasing order of basic strength in the gas phase:

C₂H₅NH₂, (C₂H₅)₂NH, (C₂H₅)₃N and NH₃

Write a short note on the following:

Carbylamine reaction

Write the structure of the product of the following reaction:

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

Benzene to m-Nitroacetophenone

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

Benzaldehyde to Benzophenone

Describe the following:

Acetylation

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

Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.

Give reason for the higher boiling point of ethanol in comparison to methoxymethane.

Arrange the set of compounds in order of increasing boiling points.

Bromomethane, Bromoform, Chloromethane, Dibromomethane.

Arrange the set of compounds in order of increasing boiling points.

1-Chloropropane, Isopropyl chloride, 1-Chlorobutane.

Explain why alkyl halides, though polar, are immiscible with water?

p-Dichlorobenzene has higher m.p. and lower solubility than those of o- and m-isomers. Discuss.