Which of the following molecules of psicose, a ketohexose, has the chiral carbon
ID: 848605 • Letter: W
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 / Dleft / 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 / LExplanation / 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 .
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