How many chiral carbon atoms are present in each of the molecules shown in Problem 20.31?
a.
b.
c.
d.

Question

How many chiral carbon atoms are present in each of the molecules shown in Problem 20.31?

a.

b.

c.

d. Fischer projection of Tagatose showing its structure and chiral carbon atoms.

Accepted Answer

Welcome back, everyone determine the number of chiral carbon atoms in each of the following molecules. We're given two molecules. And the first one is the silos, let's recall that a chiral carbon atom is a carbon atom that contains four different substituents on the chip. So we can begin with the first carbon. It is chtoh, it has two exactly the same hydrogens bonded to it. So it is not chiral. Now, carbon number two is a part of carbonel and because it's double bonded, we cannot consider it a chiral position, right? Because it's trigonal planar in geometry. Carbon number three has hygiene attached to it. It has hydroxy group, it has another chain bonne, right? That side chain corresponds to Carbel. And now if we go down, well, essentially this is a different substituent, right? We can visually see that the top substituent is different from the bottom one. The first difference occurs at the neighboring carbons cho H versus co double bonded, right? So we have located the first chiral position. Now for carbon number four, if we move down, we notice that it has hydroxy group hydrogen, those are different, right? And if we go down, we have CHTOH. If we go up, that would be a different carbon, it would be cho H with a different substi than hydrogen because that's carbo followed by chtoh. So once again, we have identified another chiral position. So we have found a total of two chiral carbon atoms or the silos. In addition to that, as we can see, we have a fission projection, right? And we have to recall that the carbon atoms with four bonds and f projections. While they are generally chiral, we don't expect them to be a chiral. And we have verified that by finding two chiral carbon atoms. Now, the erythro is the second structure that we want to consider. Once again, we can begin with the first carbon atom. It is part of an aldehyde. So it cannot be chiral because that carbon is double bonded carbon number two. However, it has hygen as one of the substitutions hydroxy group as the second one and aldehyde as the third one. And then if we move down, well, we have Cho H with C H2o H Bonne Jet. So those are four different subscriptions and we can label it as a chiral center. Now, if we move down, we expect another chiral center based on the fact that this is a fish protection. We have hydrogen, we have hydroxy group. Those are different if we move down the third substituent is chtoh. If we move up, that's cho H with carbona right. So those are definitely different and we have identified the second chiral position or see each two of which we already know that it will not have any chiral carbons because there are two exactly same hydrogens bonded to carbon. So we also have two Cairo carbon atoms for the eros. And therefore, our answer would be that the two structures, they both have two chiral carbon atoms. Thank you for watching.

How many chiral carbon atoms are present in each of the molecules shown in Problem 20.31?
a.
b.
c.
d.

Verified video answer for a similar problem:

Key Concepts

Chirality

Chiral Carbon Atom

Stereochemistry

How many chiral carbon atoms are present in each of the molecules shown in Problem 20.31?a. b. c. d.

Verified video answer for a similar problem:

Key Concepts

Chirality

Chiral Carbon Atom

Stereochemistry

How many chiral carbon atoms are present in each of the molecules shown in Problem 20.31?
a.
b.
c.
d.