Question

Assertion: Aluminium chloride $\left( AlC{{l}_{3}} \right)$ is a Lewis acid.
Reason: Lewis acids donate electrons to an acceptor.
A. Both assertion and reason are true and reason is the correct explanation for assertion.
B. Both assertion and reason are true reason is not the correct explanation for assertion.
C. Assertion is true but reason is false
D. Assertion is false but reason is true
E. Both assertion and reason are false

Answer 1

Hint: As we know that the criteria for a substance to be an acid or a base is a topic of discussion among scientists for years. Roulle said that bases taste bitter, that they possess soapy and detergent properties. And Boyle said that acids taste sour and also change colour of the litmus from blue to red.

Complete step by step answer:
- As we know that aluminium belongs to the third period in the periodic table, hence it has vacant 3d orbitals, where it can accept electrons. And as $\left( AlC{{l}_{3}} \right)$ can accept electrons and form the anions, hence we can say that it acts as a Lewis acid. We can see the reaction:
\[AlC{{l}_{3}}+C{{l}^{-}}\to AlCl_{4}^{-}\]

- As we know that aluminium is a strong electrophile, as there is presence of chlorine atoms that are high electron negative atoms which is found to reduce the electron density from the central atom.
So the correct answer is “C”:

Note: - We should note that the definition given by Lewis is applicable for those reactions in which no transference of hydrogen and other ions takes place and no ions are formed.