Selected MCQ

Current Question
Which reagent oxidizes alcohol to aldehyde?
  • A. KMnO₄
  • B. PCC
  • C. NaOH
  • D. HCl
Correct Answer: B
Explanation:
PCC stops oxidation at aldehyde stage.
Related Question 1
Which reagent reduces aldehydes to alcohols?
  • A. KMnO₄
  • B. NaBH₄
  • C. HCl
  • D. PCC
Correct Answer: B
Explanation:
Sodium borohydride reduces aldehydes.
Related Question 2
Which reagent most directly distinguishes aldehydes from ketones under mild conditions?
  • A. Bromine water
  • B. Tollens’ reagent
  • C. Dilute HCl
  • D. Sodium chloride
Correct Answer: B
Explanation:
Aldehydes reduce Tollens’ reagent whereas ordinary ketones generally do not.
Related Question 3
Which functional group is alcohol?
  • A. -COOH
  • B. -OH
  • C. -NH₂
  • D. -CHO
Correct Answer: B
Explanation:
Alcohols contain hydroxyl group.
Related Question 4
The major product of complete combustion of an alcohol in excess oxygen is:
  • A. Alkene and water
  • B. Carbon monoxide only
  • C. Carbon dioxide and water
  • D. Aldehyde and hydrogen
Correct Answer: C
Explanation:
Complete oxidation of carbon and hydrogen yields (CO_2) and (H_2O).