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Given below are two statements: Statement I: On heating with KHSO4, glycerol is dehydrated and acrolein is formed. Statement II: Acrolein has fruity odour and can be used to test glycerol’s presence. Choose the correct option. (1) Both Statement I and Statement II are correct. (2) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is incorrect. (4) Statement I is incorrect but Statement II is correct.

1. (1) Both Statement I and Statement II are correct.
2. (2) Both Statement I and Statement II are incorrect.
3. (3) Statement I is correct but Statement II is incorrect.
4. (4) Statement I is incorrect but Statement II is correct.

Correct answer: (3) Statement I is correct but Statement II is incorrect.

Solution

Statement I is correct: glycerol heated with KHSO4 is dehydrated to acrolein (CH2=CH-CHO). Statement II is incorrect: acrolein has a sharp, pungent, irritating odour, not a fruity one. So Statement I is correct but Statement II is incorrect.

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