The equivalent capacitance between $A$ and $B$ in the given circuit is (in $\mu F$)

The combination of capacitors with $C_1 = 3\,\mu F$,$C_2 = 4\,\mu F$,and $C_3 = 2\,\mu F$ is charged by connecting $A$ and $B$ to a battery. Consider the following statements:
$I.$ Energy stored in $C_1$ $=$ Energy stored in $C_2$ $+$ Energy stored in $C_3$
$II.$ Charge on $C_1$ $=$ Charge on $C_2$ $+$ Charge on $C_3$
$III.$ Potential drop across $C_1$ $=$ Potential drop across $C_2$ $=$ Potential drop across $C_3$
Which of these is/are correct?

In the given figure,the equivalent capacitance $C_{AB}$ is equal to ...... $C$.

In the given circuit,the charge on the $4\, \mu F$ capacitor will be.....$\mu C$.

$A$ network of four capacitors with capacitances $C_1 = C$,$C_2 = 2C$,$C_3 = 3C$,and $C_4 = 4C$ is connected to a battery as shown in the figure. The ratio of the charges on $C_2$ and $C_4$ is

In the given circuit,each capacitor has a capacitance of $3\,\mu F$. What is the equivalent capacitance between points $A$ and $B$ in $\mu F$?