What is the correct order of stability for the following alkenes?

When neopentyl alcohol is heated with an acid,it slowly converts into an $85:15$ mixture of alkenes $A$ and $B$,respectively. What are these alkenes $?$ (Note: $A$ is the major product and $B$ is the minor product.)

What is the product obtained when an alkene is reacted with cold and dilute alkaline potassium permanganate $(KMnO_4)$?

Consider compounds $A$, $B$ and $C$ with following structural formulae: $A = CH_{3} - CH_{2} - CH_{2} - CH_{2} - CH_{2} - OH$, $B = CH_{2} = CH - CH_{2} - CH_{2} - CH_{3}$, $C = HO - CH_{2} - CH_{2} - CH(OH) - CH_{3}$. For the conversion of $B$ from $A$, reagent $(D)$ required is . . . . . . and structural formula of product $(E)$ obtained when $C$ undergoes same reaction using excess reagent $(D)$ is . . . . . . .

Which of the following reactions is not exothermic?

Which of the following alkenes reacts fastest with $H_2$ under catalytic hydrogenation conditions?