Which of the following contains both ionic and covalent bonds?

In which of the following is the renal portal system found?

An inductor of inductance $L=400\,mH$ and resistors of resistance $R_1=2\,\Omega$ and $R_2=2\,\Omega$ are connected to a battery of emf $E=12\,V$ as shown in the figure. The internal resistance of the battery is negligible. The switch $S$ is closed at $t=0$. The potential drop across $L$ as a function of time is

The products formed in the reaction of phenol with $Br_2$ dissolved in $CS_2$ at $0^{\circ} C$ are

What is the $IUPAC$ name of the following compound?

$\frac{d}{d x} \sin ^{-1}\left(3 x-4 x^3\right)$ is equal to