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

Which of the following compounds is aromatic alcohol?

(A)
(B)
(C)
(D)

Which of the following are used to convert \[\ce{RCHO}\] into \[\ce{RCH2OH}\]?

(i) \[\ce{H2/Pd}\]

(ii) \[\ce{LiAlH4}\]

(iii) \[\ce{NaBH4}\]

(iv) Reaction with \[\ce{RMgX}\] followed by hydrolysis

Which of the following are benzylic alcohols?

(i) \[\ce{C6H5 - CH2 - CH2OH}\]

(ii) \[\ce{C6H5 - CH2OH}\]

(iii) \[\begin{array}{cc}
\ce{C6H5 - CH - OH}\\
\phantom{}|\phantom{.}\\
\phantom{..}\ce{CH3}\phantom{}
\end{array}\]

(iv) \[\begin{array}{cc}
\ce{C6H5 - CH2 - CH - OH}\\
\phantom{.......}|\phantom{}\\
\phantom{.........}\ce{CH3}\phantom{}
\end{array}\]

Out of o-nitrophenol and p-nitrophenol, which is more volatile? Explain.

Nitration is an example of aromatic electrophilic substitution and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol, which one is more easily nitrated and why?

The gas evolved when methylamine reacts with nitrous acid is:

Acid anhydrides on reaction with primary amines give ______.

Which of the following are example of synthetic rubber?

(i) Polychloroprene

(ii) Polyacrylonitrile

(iii) Buna-N

(iv) cis-polyisoprene

Vulcanisation makes rubber:

(i) more elastic

(ii) soluble in inorganic solvent

(iii) crystalline

(iv) more stiff

Identify the polymer given below:

Match materials given in Column I with the polymers given in Column II.

Which of the following enhances leathering property of soap?

Glycerol is added to soap. It functions ______.

What is a soft soap?

If soap has high alkali content it irritates skin. How can the amount of excess alkali be determined? What can be the source of excess alkali?

Why is it safer to use soap from the environmental point of view?

What is the side product of soap industry? Give reactions showing soap formation.

What is the difference between bathing soap and washing soaps?

How are transparent soaps manufactured?

What are fillers and what role these fillers play in soap?