Biologically active adrenaline and ephedrine,which are used to increase blood pressure,contain which of the following functional groups?

In the following reaction,the reason why the meta-nitro product is also formed is:

The reaction of benzylamine with nitrous acid $(HNO_2)$ produces product $A$. Identify product $A$.

Which of the following is the strongest base?

Give uses of amine compounds as medicines.

$A$ student has been given a compound $x$ of molecular formula $C_6H_7N$. $x$ is sparingly soluble in water. However,on addition of dilute mineral acid,$x$ becomes soluble in water. $x$ when treated with $CHCl_3$ and $KOH$ (alc.) produces $y$. $y$ has a specific unpleasant smell. On treatment with benzenesulphonyl chloride,$x$ gives a compound $z$ which is soluble in alkali. The number of different $H$ atoms present in $z$ is: