The Only Prep You Need

Q15

Q15

Postby skogias6733 » Wed Mar 09, 2022 11:15 am

Hi,

For this question I did it a different way i thought it wasnt B because reactants in B (5 carbons) dont have the same amount of carbons as the product? (7 carbons) and the other examples show that no carbons are being lost, only oxygen/hydrogen?

What am i missing?

Thanks
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Re: Q15

Postby goldstanda3269 » Wed Mar 09, 2022 5:22 pm

skogias6733 wrote:For this question I did it a different way i thought it wasnt B because reactants in B (5 carbons) dont have the same amount of carbons as the product? (7 carbons) and the other examples show that no carbons are being lost, only oxygen/hydrogen?


The answer is indeed B but you do have a good point: count carbons to be sure that you are not missing something.

However, you missed one thing! Look again at the model reaction given on page H2-45. Notice that the ketone appears one time but the aldehyde appears twice (science language: "one equivalent of 2-propanone + 2 equivalents of benzaldehyde). So when you are counting carbons in question 15, you must count the ketone once (3C) and the aldehyde twice (2C x 2 = 4C) which gives a total of 7C which is the structure provided.
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