The reason for resonance, is delocalisation of $\mathrm{\pi }$-electrons.

How many $1,2$-shifts are involved during the course of following reaction:

How many following carbocation undergo re-arrangement-

(a) ${\mathrm{CH}}_3{\mathrm{CH}}_2{{\mathrm{CH}}_2}^{+}$

(b) ${\left({\mathrm{CH}}_3\right)}_2\mathrm{CH}\stackrel{+}{\mathrm{CH}}{\mathrm{CH}}_3$

(c) ${\left({\mathrm{CH}}_3\right)}_3\mathrm{C}\stackrel{+}{\mathrm{CH}}{\mathrm{CH}}_3$

(d) ${\left({\mathrm{CH}}_3{\mathrm{CH}}_2\right)}_3{{\mathrm{CCH}}_2}^{+}$

(e) 

(f) 

(g) 

(h)  

For the following compounds, arrange the labelled proton in the increasing order of their ease of deprotonation.

For the following compounds, arrange the labelled proton in the increasing order of their ease of deprotonation.

Which is a stronger acid, $\mathrm{A}$ or $\mathrm{B}$ and why ?