Which have the following have an asymmetric carbon

A. CH3-CH-CH-CH3
| |
OH CH3

B. CH3-CH-CH3
|
CH3

C. CH3-CH-F
|
OH

To determine which of the given molecules have an asymmetric carbon, we need to identify if each molecule has a carbon atom that is bonded to four different groups or atoms.

A. CH3-CH-CH-CH3
| |
OH CH3

This molecule does not have an asymmetric carbon because the carbon atom in question is bonded to two hydrogen atoms and two methyl groups, which are not considered to be different groups.

B. CH3-CH-CH3
|
CH3

This molecule does not have an asymmetric carbon because the carbon atom in question is bonded to three methyl groups, which are not considered to be different groups.

C. CH3-CH-F
|
OH

This molecule does have an asymmetric carbon because the carbon atom in question is bonded to three different groups: methyl (CH3), fluorine (F), and hydroxyl (OH). These groups are considered to be different because they each have unique identities.

So, out of the given options, only molecule C has an asymmetric carbon.