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

Name a substance which can be used as an antiseptic as well as disinfectant.

What are the main constituents of dettol?

What is tincture of iodine? What is its use?

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

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.

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

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.

Give a simple chemical test to distinguish between the following pair of compounds:

Ethanal and Propanal

Write the structure of an isomer of compound C₄H₉Br which is most reactive towards S_N1 reaction

In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?