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Which of the following is incorrect?

1. (a) NaHSO3 is used in detection of carbonyl compound
2. (b) FeCl3 is used in detection of phenolic group
3. (c) Tollens’ reagent is used in detection of unsaturation
4. (d) Fehling solution is used in detection of glucose

Correct answer: (c) Tollens’ reagent is used in detection of unsaturation

Solution

Tollens’ reagent is used to detect aldehydes, not unsaturation. Unsaturation is typically tested using bromine water or Baeyer's test.

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