KCET2011Chemistrys Block Elements
Identify B and D in the following sequence of reactions.
Options
- Amethanol and bromoethane
- Bethyl hydrogen sulphate and alcoholic KOH
- Cethyl hydrogen sulphate and aqueous KOH
- Dethanol and alcoholic KOH
Correct answer
D. ethanol and alcoholic KOH
Step-by-step solution
CH ₂= CH ₂ Conc. H ₂ SO ₄ CH ₃- (A) - CH ₂- HSO ₄ (addition reaction) CH ₃- CH ₂- HSO ₄ , H ₂ O CH ₃- (B) CH ₂- OH (hydrolysis) CH ₃- CH ₂- OH PBr ₃ CH ₃ (c) - CH ₂- Br (bromination) CH ₃- CH ₂- Br Alc . KOH ( ) ( ) CH ₂= CH ₂ (dehydrohalogenation) Hence, B and D in the above given reactions are CH ₃ CH ₂ OH (ethanol) and alc. KOH .