TBR carbohydrate section

[pizza1994]

Advertisement - Members don't see this ad

Aldoses have one less sterogenic carbon in their straight chain form than ketohexoses with the same number of carbons.

is this statement wrong?

I thought ketohexoses have one less sterocenter than aldoses.....

 

[NextStepTutor_1]

Yes, this statement on it's own (out of context) appears to be backwards. To visualize this, look at the structure of glucose (an aldohexose) and fructose (a ketohexose). They both have 6 carbons and glucose has 4 stereocenters (or stereogenic carbons) while fructose only has 3 (due to the ketone functionality).

 

[BerkReviewTeach]

Aldoses have one less sterogenic carbon in their straight chain form than ketohexoses with the same number of carbons.

is this statement wrong?

I thought ketohexoses have one less sterocenter than aldoses.....

That sentence is backwards ( a typo). If you read the next two lines of the explanation, it states that a stereogenic center is lost when the aldose is converted into a ketose, which is why choice A is eliminated.

 

[pizza1994]

That sentence is backwards ( a typo). If you read the next two lines of the explanation, it states that a stereogenic center is lost when the aldose is converted into a ketose, which is why choice A is eliminated.

thanks 🙂

 

[pizza1994]

Yes, this statement on it's own (out of context) appears to be backwards. To visualize this, look at the structure of glucose (an aldohexose) and fructose (a ketohexose). They both have 6 carbons and glucose has 4 stereocenters (or stereogenic carbons) while fructose only has 3 (due to the ketone functionality).

great 🙂 thanks