For the following halides: (1) BCl_3,(2) Al | vedclass

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Question

(A) The Lewis acid strength of group $13$ trihalides depends on the tendency to accept an electron pair. $BCl_3$ is the strongest Lewis acid because b

Vedclass · Accepted Answer

$1 > 2 > 3 > 4$

Vedclass · Answer

(A) The Lewis acid strength of group $13$ trihalides depends on the tendency to accept an electron pair. $BCl_3$ is the strongest Lewis acid because boron has the smallest size,leading to a high charge density and a strong tendency to complete its octet via back-bonding,but it is also the most electron-deficient. As we move down the group from $B$ to $In$,the size of the central metal atom increases,which decreases the electron-accepting tendency. Therefore,the decreasing order of Lewis acid strength is $BCl_3 > AlCl_3 > GaCl_3 > InCl_3$.

For the following halides: $(1) \ BCl_3$,$(2) \ AlCl_3$,$(3) \ GaCl_3$,$(4) \ InCl_3$,what is the decreasing order of their Lewis acid strength?

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