AVTAR Intermediate Chemistry Class 12th
[1]
Q 5. Write chemical equation of the laboratory method for
the preparation of chlorobenzene and its chemical
reaction with the following:
(i) Concentration HNO, in the presence of H2SO4
(ii) CH2Cl in the presence of AICI,
(iii) NH, in the presence of Cu,o
[20201
Answers
Explanation:
Chlorobenzene: Preparation, Properties and uses
Chemistry Page
Chemistry Page
Nov 30, 2020·3 min read
Chlorobenzene formula and structure
Preparation
Laboratory Method
Aniline: Benzenediazonium chloride is obtained by replicating aniline with a mixture of NaNO2 and HCl at 0–5°C. Chlorobenzene is obtained by heating benzenediazonium chloride in the presence of cupreous chloride and hydrochloric acid.
C6H5NH2 + NH2 + HCl → C6H5 — N = N — Cl + 2H2O
The first reaction is called diazotization reaction and the second reaction is called sandmeyer reaction.
Read more about diazotization reaction and sandmeyer reaction
C6H5 — N = N — Cl → C6H5Cl + N2
Industrial Method
Chlorobenzene is obtained by mixing a mixture of benzene vapors, hydrogen chloride gas and oxygen (oxygen) at 250°C on a copper oxide catalyst. This reaction is used for the industrial manufacture of chlorobenzene. This method of industrial manufacture of chlorobenzene is called Rasching method.
2C6H6 + 2HCl + O2 → 2C6H5Cl + 2H2O
Physical properties
chlorobenzene is a colorless, volatile and aromatic liquid. Its boiling point is 132°C. It is insoluble in water and soluble in alcohol and ether. It is heavier than water and its relative density is 1.12.