Question

Alcl3 is weaker or stronger lewis acid than bcl3

Answer 1

Alcl3 is weaker lewis acid than bcl3

As BCl3 has added electron gain tendency, therefore, it is stronger Lewis Acid as the bond created with the base will include 2p orbital overlay which is heavier than the 3p orbital overlay in the situation of AlCl3. That will be highly acidic which has the capacity to accept the lone pair of electron.