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

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

p-Nitrobenzoic acid

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

Phenylacetic acid

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

Benazaldehyde to α-Hydroxyphenylacetic acid

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

Give the uses of freon 12.

How the following conversion can be carried out?

Isopropyl alcohol to iodoform

How the following conversion can be carried out?

Aniline to phenylisocyanide

Write the structures of the monomers used for getting the following polymers

Melamine – formaldehyde polymer

Write one difference between Multimolecular colloid and Macromolecular colloid

Write one difference between Sol and Gel

Write one difference between O/W emulsion and W/O emulsion

Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.

Write the product(s) in the following reactions

Give simple chemical tests to distinguish between the following pairs of compounds :

Propanol and 2-methylpropan-2-ol

Write one difference in Lyophobic sol and Lyophilic sol

Why a solution of [Ni(H₂O)₆]²⁺ is green while a solution of [Ni(CN)₄]²⁻ is colourless? (At. no. of Ni = 28)

Define the following term: 

Colligative properties

Write one difference between α-helix and β-pleated structures of proteins.

Name the reagents used in the following reactions:

Account for the following :

H₂S has lower boiling point than H₂O.