Identify $A$ and $B$ in the following reactions:
$A \xrightarrow[\Delta]{aq. NaOH} C_2H_5OH \xleftarrow{AgOH} B$

Reaction of $(R)-2$-butanol with $p$-toluenesulphonyl chloride in pyridine followed by reaction with $LiBr$ gives

What is obtained when chlorine is passed into boiling toluene and the product is hydrolysed?

Why is the solubility of haloalkanes in water very low?

For the following reactions:
$CH_{3}CH_{2}CH_{2}Br + Z^{-} \xrightarrow[substitution]{k_s} CH_{3}CH_{2}CH_{2}Z + Br^{-}$
$CH_{3}CH_{2}CH_{2}Br + Z^{-} \xrightarrow[elimination]{k_e} CH_{3}CH=CH_{2} + HZ + Br^{-}$
where
$Z^{-} = CH_{3}CH_{2}O^{-} (A)$ or $(CH_{3})_{3}CO^{-} (B)$
$k_s$ and $k_e$ are,respectively,the rate constants for the substitution and elimination,and $\mu = \frac{k_s}{k_e}$,the correct option is:

The major product of the following reaction,if it occurs by $S_N2$ mechanism is :