Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :
- Both Statement I and Statement II are incorrect
- Both Statement I and Statement II are correct
- Statement I is incorrect but Statement II is correct
- Statement I is correct but Statement II is incorrect
Answer
(3) Statement I is incorrect but Statement II is correct
Solution
Statement I: With aqueous KOH, OH- replaces Cl by nucleophilic substitution:
R-Cl + KOH(aq) R-OH + KCl
Alcohols are formed by substitution, not by elimination Statement I is incorrect.
Statement II: Alcoholic KOH (alkoxide/hydroxide acting as a base) removes an H from the β-carbon and Cl- leaves from the α-carbon (β-elimination, dehydrohalogenation):
CH3-CH2-Cl alc. KOH, CH2=CH2 + KCl + H2O
Statement II is correct.
Answer: (3)