Which of the structures above are identical?
1.A and C only
2.B and D only
3.A and D only
4.B, C, and D only
5.all are the same
Question 2What is the relationship between the two compounds shown below?
1.they are identical
2.they are constitutional isomers
3.they are nonsuperimposable mirror images of each other
4.they are different conformations of the same compound
5.they have different atom connectivity
Question 3What are the absolute configurations of the chiral centers in the molecule shown below?
1.1: R, 2: R
2.1: R, 2: S
3.1: S, 2: S
4.1: S, 2: R
5.because of the ring structure, the compound does not have chiral centers
Question 4Despite its name, ascorbic acid (vitamin C) is not a carboxylic acid, but rather has the structure shown below. How many stereoisomers of this compound are possible?
1.1
2.2
3.3
4.4
5.8
Question 5How many stereogenic centers are present in the following molecule?
1.0
2.1
3.2
4.4
5.7
Question 6Which of the following statements about enantiomers is false?
1.They have identical melting points.
2.They have identical boiling points.
3.The magnitude of their specific rotations is identical.
4.They have identical densities.
5.They react at the same rate with optically active reagents.
Structures involved in the sense of taste.
The uterus and associated structures.
Structures of the ionized forms of some representative fatty acids (part 1)
Structures of human DNA polymerase g (left) and T7 phage DNA polymerase (right) holoenzymes
Major Structures of the Eye
Summary of Structures of the Ear