What is the molecular formula of $$p$$-toluidine?

If $$0.01 \mathrm{~m}$$ aqueous solution of an electrolyte freezes at $$-0.056 \mathrm{~K}$$. Calculate van't Hoff factor for an electrolyte (cryoscopic constant of water $$=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$$ )

Which element from following does NOT belong to chalcogen family?

What is IUPAC name of following compound?