$CH_3-CH_2-CH_2-Cl$ $\xrightarrow{KOH_{(aq)}} X$ $\xrightarrow{H^{+}/\Delta} Y$ $\xrightarrow{Cl_2/H_2O} Z$ (Major); $Z$ is

Which product is obtained from the reaction between $CH_3ONa$ and $(CH_3)_3CBr$?

Assertion: $2-$Bromobutane on reaction with sodium ethoxide in ethanol gives $1-$butene as a major product.
Reason: $1-$Butene is more stable than $2-$butene. According to Saytzeff's rule,$2-$butene should be the product which is more branched or substituted compound and hence,more stable than $1-$butene.

$Ph-CH(Br)-CH_2-CH_2-Br \xrightarrow[\Delta]{Zn-Cu} \text{Product}$. The product of the above reaction is:

In the dehydrohalogenation of $2$-bromobutane,which conformation leads to the formation of $cis$-but-$2$-ene?

The major product $(A)$ of the following reaction is: