A) Acetaldehyde
B) Paraldehyde
C) Metaldehyde
D) None of these
Correct Answer: B
Solution :
Paraldehyde is a pleasant smelling trimer of acetaldehyde. It can be prepared by the action of cone. \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\] on acetaldehyde at room temperature.
Paraldehyde is used as hypnotic in medicines and to induce sleep. Acetaldehyde is \[\text{C}{{\text{H}}_{\text{3}}}\text{CHO}\] and metaldehyde is trimer of formaldehyde also known as trioxane. 
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