Arrange the following compounds in the decreasing order of reactivity towards $$\mathrm{S}_{\mathrm{N}} 1$$ reaction.

Given below are 4 species with one odd electron on the Carbon atom.

$$\begin{array}{ll} \mathrm{A}=\left(\mathrm{CH}_3\right)_3 \stackrel{\bullet}{\mathrm{C}} & \mathrm{B}=\left(\mathrm{C}_6 \mathrm{H}_5\right)_3 \stackrel{\bullet}{\mathrm{C}} \\ \mathrm{C}=\left(\mathrm{C}_6 \mathrm{H}_5\right)_2 \stackrel{\bullet}{\mathrm{C}} \mathrm{H} & \mathrm{D}=\left(\mathrm{CH}_3\right)_2 \stackrel{\bullet}{\mathrm{C}} \mathrm{H} \end{array} $$

Choose the correct decreasing order of stability of the species.

Rank the following compounds in order of increasing basicity.

Select the strongest base from the given compounds:

[A] p- $$\mathrm{NO}_2-\mathrm{C}_6 \mathrm{H}_4 \mathrm{NH}_2$$

[B] $$\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2-\mathrm{NH}_2$$

[C] $$\mathrm{m}-\mathrm{NO}_2-\mathrm{C}_6 \mathrm{H}_4 \mathrm{NH}_2$$

[D] $$\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$$