Write the main product of the given reactions:
$1$. $(CH_3)_2CHCHBrCH_3 \xrightarrow[ethanol]{KOH, \Delta }$
$2$. $(CH_3)_2CHCH(OH)CH_3 \xrightarrow{H_2SO_4, \Delta }$

(N/A) For reaction $1$,the dehydrohalogenation of $2$-bromo-$3$-methylbutane with alcoholic $KOH$ follows $Saytzeff$ rule. The more substituted alkene,$2$-methyl-$2$-butene,is the major product $(80\%)$,while $3$-methyl-$1$-butene is the minor product $(20\%)$.
For reaction $2$,the acid-catalyzed dehydration of $3$-methylbutan-$2$-ol follows $Saytzeff$ rule. The more substituted alkene,$2$-methyl-$2$-butene,is the major product,while $3$-methyl-$1$-butene is the minor product.