VISUAL SKILLS Which functional group is not present in this molecule?

a. carboxyl b. sulfhydryl c. hydroxyl d. amino

Video transcript

Hi everyone now. But look at the problem, identify the functional groups attached to the following molecule. We have a molecule mannitol, this thing of a carbon uh skeleton surrounded by these ohh groups. And as we recall from content videos, a functional group is a group of atoms in a molecule that behave in a certain distinctive way of certain distinctive chemical properties and behave in similar ways regardless of the other atoms in the molecule. So we're going to look at these O. H groups and think about which functional groups group this is. Let's look down at our answer choices. First one A says methyl groups. Well methyl groups would be C. H. Three. So that is not the correct answer. To eliminate choice. A choice B says hydroxy groups and hydroxy group. We can look at that name for a clue. We've got hydrogen and oxygen for oxygen is indeed O. H. So that is the correct label for our functional groups. Hydroxy but to be thorough we'll just keep looking down a car box. Cell group consists of a carbon double bonded to an oxygen with another O. H. Bonded to it. So that is also not the correct answer. And finally, choice D phosphate groups. Well, a phosphate group, as you can see by the fosse in here consists of a central phosphorus surrounded by four oxygen's usually with a double bond to one. These usually have negative charges and then attached to the molecule. So this is obviously not a phosphate group. So we can eliminate choice D. So again the correct answer is b hydroxyl groups. See you next time.