Arrange the following carbocations in the decreasing order of their stability:
$a$. $CH_3-CH^{+}-CH_3$
$b$. $CH_3-CH^{+}-OCH_3$
$c$. $CH_3-CH^{+}-COCH_3$

The stability of carbanions follows the order:
$I: CH_3CH_2CH_2\bar{C}H_2$
$II: CH_3\bar{C}HCH_2CH_3$
$III: (CH_3)_3\bar{C}$
$IV: CH_3\bar{C}(Ph)CH_2CH_3$

Consider the following compounds:
$(I)$ $(CH_3)_3C-CH^{\bullet}-C_6H_5$
$(II)$ $(C_6H_5)_3C^{\bullet}$
$(III)$ $2$-methylbicyclo$[2.2.1]$hept$-2-$yl radical (as shown in the image)
Hyperconjugation occurs in:

The most stable carbonium ion is:

State True or False for the following statements:
$(i)$ Carbon possesses $sp^2$ hybridization in a carbocation.
$(ii)$ Carbon possesses $sp^3$ hybridization in a carbocation.
$(iii)$ $A$ carbocation is formed by homolytic fission of a bond.
$(iv)$ Carbocations are very stable.

$A$ tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?