Discuss the following observations :
(d) ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{NH}}_2$ is stronger base than ${\mathrm{CH}}_2={\mathrm{CHNH}}_2$.

Discuss the basic strength of two nitrogens in benzimidazole.

In each of the following pair of compounds, which is more basic in aqueous solution ? Give an explaination for your choice :
(ii) ${\mathrm{CH}}_3{\mathrm{CONH}}_2$ or  

Answer the following questions:
(i) Which of the indicated $\mathrm{H}$ is abstracted rapidly by bromine radical and why?

Answer the following Questions:

(ii) One of the indicated proton ${\mathrm{H}}_{\mathrm{a}}$ or ${\mathrm{H}}_{\mathrm{b}}$, is approximately ${10}^{30}$ times more acidic than other, which is more acidic and why?

Explain the following

(i) $\mathrm{NC}-{\mathrm{CH}}_2-\mathrm{CN}$ is a stronger acid than ${\mathrm{CH}}_3-\mathrm{CO}-{\mathrm{C}}_2{\mathrm{H}}_5$.

Explain the following

(ii) ${\mathrm{CH}}_3-\mathrm{CO}-{\mathrm{C}}_2{\mathrm{H}}_5$ is more acidic than ${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2$.