Among the following, which is not a lewis acid ?
(A) SnCI2,
(B) AICI3
(C)CCI4
(D) SICI4
Answers
Answer:
CCl4 is not a Lewis acid
(C) CCl4 is not Lewis acid
Lewis Acid
Lewis acid is any substance, such as the H+ ion, that can accept a pair of nonbonding electrons.
Lewis acid is an electron-pair acceptor. A Lewis base is any substance, such as the OH- ion, that can donate a pair of nonbonding electrons.
" Lewis acids play a main role as a catalyst in the Friedel-Crafts reaction – AlCl3 accepts a lone pair of electrons belonging to the chloride ion leading to the formation of AlCl4– in the Friedel-Crafts alkylation process.
This also leads to the formation of the highly electrophilic carbonium ion which acts as a strong Lewis Acid ".
The chemical reaction can be written as follows.
RCl + AlCl3 ⟶ R+ + AlCl4-
- Lewis bases have immense applications in the modification of the selectivity and the activity of metallic catalysts.
- For the production of pharmaceuticals, asymmetric catalysis is an important part of enantioselective synthesis.
- Several Lewis bases have the ability to form many bonds with Lewis acids.
- These compounds are also called ‘multidentate Lewis bases’ and have a wide range of industrial and agricultural applications.