The charge on $4\mu F$ capacitor in the given circuit is $\left(in \mu C\right)$

 

$1\mu F and 5\mu F are in parallel \Rightarrow 6\mu F$

$4\mu F and 6\mu F are in series \Rightarrow 2.4\mu F$

In top branch,

$Q=C_{eq}V=2.4\times 10=24\mu C$