question_answer

An alkene, on ozonolysis gives formaldehyde and acetaldehyde. The alkene is:

A)  ethene        

B)  propene

C)  butene-1       

D)  butene-2

Correct Answer: B

Solution :

(i) \[\underset{propene}{\mathop{C{{H}_{3}}CH}}\,=C{{H}_{2}}+{{O}_{3}}\xrightarrow{{}}\] (ii) Ethene gives two molecules of formaldehyde on ozonolysis. (iii) Butene-1 gives one molecule of formaldehyde and one molecule of propanaldehyde on ozonolysis. (iv) Butene-2 gives two molecules of ethanol on ozonolysis.