The elimination reaction of $2-$bromopentane to form pent$-2-$ene involves:
$a$. $\beta-$Elimination reaction
$b$. Following Zaitsev rule
$c$. Dehydrohalogenation reaction
$d$. Dehydration reaction

$A$ dihalogen derivative '$X$' of a hydrocarbon with three carbon atoms reacts with alcoholic $KOH$ to give another hydrocarbon which forms a red precipitate with ammoniacal $Cu_2Cl_2$. '$X$' gives an aldehyde upon reaction with aqueous $KOH$. What is the compound '$X$'?

In the given reaction $3-$Bromo$-2,2-$dimethylbutane $\xrightarrow{C_2H_5OH}$ (Major product) $'A'$. Product $A$ is:

The reaction of a mixture of two alkyl halides with sodium in ether gives $2-$methylpropane. The alkyl halides are:

In which of the following reactions is the $Saytzeff$ alkene the major product?

Elimination of bromine from $2-$bromobutane results in the formation of