JEE Advance - Chemistry (2020 - Paper 1 Offline - No. 6)
The Fischer projection of D-erythrose is shown below :
D-erythrose and its isomers are listed as P, Q, R, and S in Column - I. Choose the correct relationship of P, Q, R, and S with D-erythrose from Column - II.
D-erythrose and its isomers are listed as P, Q, R, and S in Column - I. Choose the correct relationship of P, Q, R, and S with D-erythrose from Column - II.
| P | Q | R | S |
|---|---|---|---|
| 2 | 3 | 2 | 2 |
| P | Q | R | S |
|---|---|---|---|
| 3 | 1 | 1 | 2 |
| P | Q | R | S |
|---|---|---|---|
| 2 | 1 | 1 | 3 |
| P | Q | R | S |
|---|---|---|---|
| 2 | 3 | 3 | 1 |
Explanation
First of all, we need to convert wedge-dash formula into Fischer projection formula.
Now we can clearly see, that compound P is same as given compound, thus compound P is identical to D-erythrose.
Compound Q and D-erythrose are not mirror images of one another and are non-superimposable on one another. Thus, they are diastereomers.
Compound R and D-erythrose are also not mirror images of one another and are non-superimposable on one another. Thus, they are diastereomers.
Compound S and D-erythrose are chiral molecules. They are mirror images of one another. Furthermore, the molecules are non-superimposable on one another. This means that the molecules cannot be placed on top of one another and give the same molecule. Chiral molecules with one or more stereocenters can be enantiomers.
Hence, the correct option is (c).
Now we can clearly see, that compound P is same as given compound, thus compound P is identical to D-erythrose.
Compound Q and D-erythrose are not mirror images of one another and are non-superimposable on one another. Thus, they are diastereomers.
Compound R and D-erythrose are also not mirror images of one another and are non-superimposable on one another. Thus, they are diastereomers.
Compound S and D-erythrose are chiral molecules. They are mirror images of one another. Furthermore, the molecules are non-superimposable on one another. This means that the molecules cannot be placed on top of one another and give the same molecule. Chiral molecules with one or more stereocenters can be enantiomers.
Hence, the correct option is (c).
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