Which of the following radiations has the highest frequency?

Which of the following is not an electromagnetic wave?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A:$ $EM$ waves used for optical communication have longer wavelengths than that of microwaves employed in $RADAR$ technology.
Reason $R:$ Infrared $EM$ waves are more energetic than microwaves (used in $RADAR$).
In the light of the given statements,choose the correct answer from the options given below:

The radio waves of frequency $300 \,MHz$ to $3000 \,MHz$ belong to

Match the List-$I$ (Phenomenon associated with electromagnetic radiation) with List-$II$ (Part of electromagnetic spectrum) and select the correct code from the choices given below:

List-$I$	List-$II$
$I$. Doublet of sodium	$A$. Visible radiation
$II$. Wavelength corresponding to temperature associated with the isotropic radiation filling all space	$B$. Microwave
$III$. Wavelength emitted by atomic hydrogen in interstellar space	$C$. Short radio wave
$IV$. Wavelength of radiation arising from two close energy levels in hydrogen	$D$. $X$-rays

Microwaves are used in