How will you convert the following:
(i) Ethyl alcohol to ethene
(ii) Propene to 2-bromopropane.

Explanation

(i) Ethyl alcohol undergoes dehydration (Water molecules is removed) by heating with conc. `H_2 SO_4` at `433-443` K .

(ii) Propene reacts with HBr, in the absence of perioxide gives 2-bromopropane which is a product according to Markovnikov,s rule.
`underset("Propene")(CH_(3)-CH=CH_(2)+HBr) underset("of peroxide")overset("In the absence")to underset("2-bromopropane")(CH_(3)-overset(Br)overset(|)(CH)-CH_(3))`