First slide

Atomic and physical properties

Question

Which of the following statements is correct?

Easy

A

BCl₃ and AlCl₃ are both Lewis acids and BCl₃ is stronger than AlCl₃
B

BCl₃ and AlCl₃ are both Lewis acids and AlCl₃ is stronger than BCl₃
C

BCl₃ and AlCl₃ are both equally strong Lewis acids
D

BCl₃ and AlCl₃ are both not Lewis acids

Solution

Acidic strength order:
$\underrightarrow {BC{l_3} > \,AlC{l_3}}$
As atomic size of central atom increases,
metallic nature increases,
electron accepting tendency decreases,
Lewis acidic strength decreases.

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