Assertion. Tertiary carbocations are generally formed more easily than primary carbocations. 

Reason. Hyperconjugation as well as inductive effect due to additional alkyl groups stabilise tertiary carbocations. 

Arrange the following carbanions in order of their decreasing stability

(i) ${\mathrm{H}}_3\mathrm{C}-\mathrm{C}\equiv {\mathrm{C}}^{-}$

(ii) $\mathrm{H}-\mathrm{C}\equiv {\mathrm{C}}^{-}$

(iii) ${\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_2^{-}$

 Arrange the following free radicals in order of decreasing stability:

$\mathrm{Methyl}\left(\mathrm{I}\right), \mathrm{Vinyl}\left(\mathrm{II}\right),\mathrm{Allyl}\left(\mathrm{III}\right) \mathrm{and} \mathrm{benzyl}\left(\mathrm{IV}\right)$

Which of the following carbocations is most stable?

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

The stability order of the above carbocations is 

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

The correct order of stability of given carbocation is:

Define ambident nucleophile with an example.