Classify each of the following as a Lewis acid or a Lewis base

Question

Question:

Classify each of the following as a Lewis acid or a Lewis base

Answer & Explanation:

Definition of Lewis acid and Lewis base

Lewis acids are those molecules or ions which are electronic deficient either having empty orbitals due to positive charge or due to incomplete octet. Such molecules or ions have a tendency to accept electrons from other species which are electron-rich and are called as Lewis bases.

Answer and Explanation:

1) H−
It is a hydride ion that means hydrogen-containing negative charge density on it.
This will behave as a Lewis base.

2) CaO
CaO is a lewis base as it has oxide ion which has lone pair to donate.

3) Ag+
Silver ion is Lewis acid as it contains empty orbitals to accept electrons.

4) CO2
It contains a carbon atom attached to two oxygen atoms which means carbon will have a partial positive charge.
So, it will have a tendency to accept electrons. So, it will behave as lewis acid.

5) Br−
It is a negatively charged species and bromine ion is less electronegative. So, it will have a tendency to donate electrons.
So, it will be a Lewis base.

6) (CH3)2NH
The nitrogen atom in this secondary amine has lone pair on it and also two methyl groups are attached to the nitrogen.
So, it will have a tendency to donate electrons. Hence, it is a Lewis base.

7) AlCl3
In Aluminium trichloride, aluminum has an incomplete octet. So, it will be electron-deficient and behave as a lewis acid.

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Answer ( 1 )

  1. Definition of Lewis acid and Lewis base

    Lewis acids are those molecules or ions which are electronic deficient either having empty orbitals due to positive charge or due to incomplete octet. Such molecules or ions have a tendency to accept electrons from other species which are electron-rich and are called as Lewis bases.

    Answer and Explanation:

    1) H−
    It is a hydride ion that means hydrogen-containing negative charge density on it.
    This will behave as a Lewis base.

    2) CaO
    CaO is a lewis base as it has oxide ion which has lone pair to donate.

    3) Ag+
    Silver ion is Lewis acid as it contains empty orbitals to accept electrons.

    4) CO2
    It contains a carbon atom attached to two oxygen atoms which means carbon will have a partial positive charge.
    So, it will have a tendency to accept electrons. So, it will behave as lewis acid.

    5) Br−
    It is a negatively charged species and bromine ion is less electronegative. So, it will have a tendency to donate electrons.
    So, it will be a Lewis base.

    6) (CH3)2NH
    The nitrogen atom in this secondary amine has lone pair on it and also two methyl groups are attached to the nitrogen.
    So, it will have a tendency to donate electrons. Hence, it is a Lewis base.

    7) AlCl3
    In Aluminium trichloride, aluminium has an incomplete octet. So, it will be electron-deficient and behave as a lewis acid.

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