IIT JAM

follow

Top Resources

S

Shweta Thakur posted an Question

July 26, 2021 • 20:54 pm

30 points

IIT JAM
Chemistry (CY)

Plz tell the r and s configuration of these compound and also tell which is chiral and achiral

ed e OBn BocHN Me OBn BocHN 1b e 1a Dy LOxidation kysiyzihxohxiy

2 Answer(s)

0 Likes
2 Comments
0 Shares

>
Paramjeet verma

If a molecule does not have any 'Plane of symmetry' or 'Centre of symmetry' then the molecule will be chiral. otherwise achiral. Chiral molecules are optically active ( rotate the plane of plane polarised light) and achiral molecules are optically inactive (no effect on plane polarised light)
- Likes(0)
- Reply(0)

>
Paramjeet verma Best Answer

Both are chiral. And both have two chiral centres.
- Likes(0)
- Reply(6)
sir in first two chiral carbons I think in second also r should be there if we rotate clockwise
- Like(0)
and sir plz tell chiral and achiral difference
- Like(0)
Yes shweta, you are right ..rotation is clockwise but see the position of the 4th group. It is not on dash position (below the plane of the paper). So you have to change the configuration that is from R to S. Remember while assigning priority the lowest priority should be on dash position. If not then change the configuration.
- Like(0)
comment if doubt remains.
- Like(1)
sir didn't get that why it is s
- Like(0)
It just a rule to assign the configuration of the optically active molecules. Also called CIP rule.
- Like(1)

T