- APyramidal
- BTetrahedral
- COctahedral
- ✓Trigonal planar
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$(a)$ $U$ and $H$ each depends only on temperature
$(b)$ Compressibility factor $z$ is not equal to $1$
$(c)$ $C _{ P , m }- C _{ V , m }= R$
$(d)$ $d U = C _{ V } d T$ for any process
$A : 1s^2\, 2s^2\, 2p^6$
$B : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^3$
$C : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^5$

Statement $I$: Group $13$ trivalent halides get easily hydrolyzed by water due to their covalent nature.
Statement $II$: $\mathrm{AlCl}_3$ upon hydrolysis in acidified aqueous solution forms octahedral $\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ ion.
In the light of the above statements, choose the correct answer from the options given below :