Which will not react with phenol:
Correct answer: B. KMnO4/OH-
- A. NaOH
- B. KMnO4/OH-
- C. Br2
- D. Na
Explanation
Potassium permanganate (KMnO4)/OH- will oxidise phenol to form 1,4-dihydroxybenzene, also known as hydroquinone. This is because potassium permanganate is a strong oxidizing agent, and phenol is a reducing agent. The reaction is an oxidation-reduction reaction, and it produces hydroquinone and manganese dioxide.
Last updated
About Alcohols and Phenols
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
Practise Alcohols and Phenols
535 free Alcohols and Phenols MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.