How Many Stereoisomers Can Aldoheptose Have?

[kasse]

Just to check that I've understood the concept of isomerism:

Homework Statement

How many stereoisomers are possible for

a) a 2-ketoheptose
b) an aldoheptose
c) a ketotriose

2. The attempt at a solution

a) First: does the "2" mean that the carbonyl carbon is the second C-atom?

The molecule has 4 asymmetric centers and hence 2^4 = 16 possible stereoisomers.

b) 5 asymmetric centers, so 2^5 = 32 possible stereoisomers

c) No asymmetric centers, therefore 2^0 = 1 possible stereoisomer


Correct?

 

[Borek]

Looks OK to me, but second opinion won't hurt.