- ✓Pyrogallol
- BPhloroglucinol
- CResorcinol
- DQuinol
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$(I)$ It is easier to remove $2 \mathrm{p}$ electron than $2 \mathrm{s}$ electron
$(II)$ $2 \mathrm{p}$ electron of $\mathrm{B}$ is more shielded from the nucleus by the inner core of electrons than the $2 s$ electrons of $Be.$
$(III)\; 2 s$ electron has more penetration power than $2 \mathrm{p}$ electron.
$(IV)$ atomic radius of $\mathrm{B}$ is more than $\mathrm{Be}$
(Atomic number $\mathrm{B}=5, \mathrm{Be}=4$ )
The correct statements are

$CH_3 -CH = CH -CH( OH)-Me$ is :
while $E_{Z{n^{2 + }}/Zn}^o = - 0.76\,V$

$M + L \rightleftharpoons ML$
$ML + L \rightleftharpoons M{L_2}$
are $4$ and $3$. Hence, overall stability constant for
$M + 2L \rightleftharpoons M{L_2}$ is