What is the major product formed when $cis-2-butene$ reacts with $Br_2$ in $CCl_4$?

Reaction $(1): CH_3-CH=CH-CH_3$ $\xrightarrow{\text{Cold } KMnO_4} (A)$ $\xrightarrow{NaIO_4} (B)$ ($2$ moles)
Reaction $(2): CH_3-CH=CH-CH_3 \xrightarrow{KMnO_4/NaIO_4} (C)$ ($2$ moles)
Product $(B)$ and $(C)$ respectively are:

Identify the major product $X$ in the following dehydration reaction: $(CH_3)_3C-CH(OH)-CH_3 \xrightarrow{H_2SO_4} X$.

Predict the major product $A$ for the following reaction:
$1\text{-methyl-1-vinylcyclohexane} + HBr \xrightarrow{CCl_4} A$

Identify products $[A]$,$[B]$,and $[C]$ in the following reaction sequence:
$CH_3-C \equiv CH$ $\xrightarrow{H_2, Pd/C} [A]$ $\xrightarrow[(ii) Zn, H_2O]{(i) O_3} [B] + [C]$

Among the alkenes, which one produces tertiary butyl alcohol on acid hydration?