In which of the following $\Delta \text{G}$ decreases if there can be some intramolecular rearrangement?

Which of the following carbocations is most stable?

The correct order of stability of given carbocation is:

Choose the correct statement regarding the formation of carbocations A and B given :-

Assertion (A): Tertiary carbocations are more reactive than secondary and primary carbocations.

Reason (R): Hyper conjugation, as well as inductive effect due to additional alkyl groups stabilise tertiary carbocations.

The major products $\mathrm{A}$ and $\mathrm{B}$ in the following reactions are

The decreasing order of the stability of the following carbocations is

The stability order of the above carbocations is 

Consider the following carbocations

(a) ${\mathrm{Cl}}_3{\mathrm{C}}^{+}$

(b) ${\mathrm{Cl}}_2{\mathrm{CH}}^{+}$

(c) ${{\mathrm{ClCH}}_2}^{+}$

(d) ${{\mathrm{CH}}_3}^{+}$

The stability sequence follows the order 

Define ambident nucleophile with an example.