The most stable carbonium ion is:

Among the given pairs,in which pair does the second compound have less enol content than the first compound?

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 most stable carbanion among the following is

Rank the transition states that occur during the following reaction steps in order of increasing stability (least $\to$ most stable):
$1. CH_3-OH_2^+ \to CH_3^+ + H_2O$
$2. (CH_3)_3C-OH_2^+ \to (CH_3)_3C^+ + H_2O$
$3. (CH_3)_2CH-OH_2^+ \to (CH_3)_2CH^+ + H_2O$

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