Choose the most reasonable reaction intermediate for the following reaction.

In the following carbocation,the $H$ or $CH_3$ group that is most likely to migrate to the positively charged carbon is:

Write in ascending order of stability of $1^{\circ}$,$2^{\circ}$ and $3^{\circ}$ carbocations and free radicals.

Which of the following intermediates has a complete octet around the carbon atom?

Which one of the following is the most stable carbocation?

State whether the following statements are True or False:
$(i)$ $CH_3-CH_2^+$ is more stable than $CH_3^+$
$(ii)$ $CH_3-CH_2^+$ is less stable than $CH_3^+$
$(iii)$ $(CH_3)_3C^+$ is less stable than $CH_3^+$
$(iv)$ $(CH_3)_3C^+$ is more stable than $CH_3^+$