Which of the following molecules of psicose, a ketohexose, has the chiral carbon

Question

Which of the following molecules of psicose, a ketohexose, has the chiral carbon furthest from the carbonyl group marked with a 1?

Part B

In the following Fischer projection, the hydroxyl group on the chiral carbon furthest from the carbonyl group points _____, meaning that this is the _____ isomer of tagatose.

left / L

Part C

In the following Fischer projection, the hydroxyl group on the chiral carbon furthest from the carbonyl group points _____, meaning that this is the _____ isomer of mannose.

Part B

In the following Fischer projection, the hydroxyl group on the chiral carbon furthest from the carbonyl group points _____, meaning that this is the _____ isomer of tagatose.

right / D right / L left / D

left / L

Part C

In the following Fischer projection, the hydroxyl group on the chiral carbon furthest from the carbonyl group points _____, meaning that this is the _____ isomer of mannose.

right / D right / L left / D left / L

Explanation / Answer

answer 1) the chiral carbon means that a ny atom in the given organic molecule if it is bonded to four different kind of atoms it is known as "chiral". If a carbon atom (has four different kinds of group attached to it , then that carbon atom forms a chiral center .

look at 2 and 3 molecule C1 they are not chiral as they are both bounded with 2 hydrogen .

now we are left with 1 and 4 there C1 are both chiral but we have to select that chiral center which if far from carbonyl

hence we select 4 th one which is far from carbonyl group .

correct option is 4 th .

answer 2) corect option is a) right / D

answer 3) correct option is d) left /L

the D or L designation refers to the configuration of the chiral carbon(OH) farthest from the aldehyde or keto group .

if OH is on right hand side it is denoted by D and if OH is on left hand side it is denoted by L .

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.