Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

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.

What type of isomerism is shown by the complex [Co(en)₃]Cl₃

What type of isomerism is shown by the complex [Co(NH₃)₆] [Cr(CN)₆]?

What is the effect of adding a catalyst on Activation energy (E_a)

What type of isomerism is shown by the complex [Co(NH₃)₅(SCN)]²⁺?

The cell in which the following reaction occurs:

`2Fe^(3+) (aq) + 2I^(-) (aq) ---> 2Fe^(2+) (aq) + I_2 (s)` has `E_"cell"^@` = 0.236 V at  298 K. Calculate the standard Gibbs energy of the cell reaction. (Given : 1 F = 96,500 C mol⁻¹)

A first-order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction. (Given : log 2 = 0·3010, log 4 = 0·6021, R = 8·314 JK^–1 mol^–1)

What type of isomerism is exhibited by the complex [Co(NH₃)₅Cl]SO₄?

Write the structures of the main products of the following reactions:

Write the structures of the main products of the following reactions: