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 $BCl_3 > AlCl_3 > GaCl_3 > InCl_3$.

Column $I$	Column $II$
$A$. $Bi^{3+} \longrightarrow (BiO)^{+}$	$P$. Heat
$B$. $[AlO_2]^{-} \longrightarrow Al(OH)_3$	$Q$. Hydrolysis
$C$. $SiO_4^{4-} \longrightarrow Si_2O_7^{6-}$	$R$. Acidification
$D$. $(B_4O_7^{2-}) \longrightarrow [B(OH)_3]$	$S$. Dilution by water

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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Match the following:

Column $I$ Column $II$

$A$. $Bi^{3+} \longrightarrow (BiO)^{+}$ $P$. Heat

$B$. $[AlO_2]^{-} \longrightarrow Al(OH)_3$ $Q$. Hydrolysis

$C$. $SiO_4^{4-} \longrightarrow Si_2O_7^{6-}$ $R$. Acidification

$D$. $(B_4O_7^{2-}) \longrightarrow [B(OH)_3]$ $S$. Dilution by water

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