It has been a week now that my question is remained unanswered i guess the experts are doing their job positively but not in my case the question was asked in my exam of chemistry past weekand and that is why i am eager to know the answer, so here's the quetion whose answer i was looking for.!"A conjugated alkadiene having molecular formula C13H22 on ozonolysis yielded ethyl-methyl ketone and cyclo hexane carbaldehyde.Identify the diene,wite its structural formula and give its IUPAC name"???.

Please note that one of the product is missing from the mentioned question. Since it is a diene therefore it will yield 3 products on ozonolysis. 

The given compound C13H22 is a hydrocarbon which has its two double bond in conjugation. 
As we get an ethyl methyl ketone therefore one of the carbon attached to double bond must be substituted with a methyl and an ethyl group.
As on ozonolysis we get cyclohexane carbaldehyde therefore one of the carbon bearing double bond should have cyclohexane as a substituent. 
Hence the possible compound which justifies all the given information is as follows:
 


Whose IUPAC is 1-Cyclohexyl-4-methylhex-1,3-diene.

The reaction for the ozonlysis is given below: 


The third compound thus formed is glyoxal. i.e. CHO-CHO. 
 

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