Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

Let $M$ be the foot of the perpendicular from a point $P$ on the parabola $y^2=8(x-3)$ onto its directrix and let $S$ be the focus of the parabola. If $\triangle SPM$ is an equilateral triangle,then $P$ is equal to

Which of the following is an example of an interstitial hydride?

If $\frac{\tan 3A}{\tan A} = a$,then $\frac{\sin 3A}{\sin A}$ is equal to

If $\tan ^{-1} x = y$,then . . . . . . .

Match the following:

Column-$I$	Column-$II$
$1$. Pituitary gland	$p$. Trachea
$2$. Thyroid gland	$q$. Bony cavity (Sella tursica)
$3$. Thymus	$r$. Anterior part of kidney
$4$. Adrenal glands	$s$. Dorsal side of the heart and aorta