The D, L system of relative configuration is not 100% correct, and hence R, S system was adopted as a defect proof, absolute configuration. The R, S system involves the following steps:
Step l: The four atoms or groups attached to the chiral carbon atom are assigned a sequence of priorities according to sequence rules.
Step ll: The arrangement of these four atoms is observed by drawing a curved arrow from the atom with the highest priority (1) to the atoms with next highest (2) and if the direction of this arrows is clockwise it indicates R configuration. While the anticlockwise direction from group (1) to group (2) indicates S configuration. However, this convention is true only when the atom with the lowest priority (4) is present on the vertical bond, in case of Fischer projection. In case, the atom (4) lies on the horizontal bond opposite configuration is assigned.
Now observe the monochlorination of 2- chlorobutane.
Priority order of some groups:
Cl>CH2CH3>CH3>H;CH2Cl>CH2CH3,CH2CH2Cl>CH3
Which of the following structures can exist as mesomer?
The D, L system of relative configuration is not 100% correct, and hence R, S system was adopted as a defect proof, absolute configuration. The R, S system involves the following steps:
Step l: The four atoms or groups attached to the chiral carbon atom are assigned a sequence of priorities according to sequence rules.
Step ll: The arrangement of these four atoms is observed by drawing a curved arrow from the atom with the highest priority (1) to the atoms with next highest (2) and if the direction of this arrows is clockwise it indicates R configuration. While the anticlockwise direction from group (1) to group (2) indicates S configuration. However, this convention is true only when the atom with the lowest priority (4) is present on the vertical bond, in case of Fischer projection. In case, the atom (4) lies on the horizontal bond opposite configuration is assigned.
Now observe the monochlorination of 2- chlorobutane.
Priority order of some groups:
Cl>CH2CH3>CH3>H;CH2Cl>CH2CH3,CH2CH2Cl>CH3
Which of the following structures can exist as mesomer?
The correct option is B D
Mesomer is an optically inactive compound whose molecule is superimposable on its mirror image in spite of the presence of chiral carbon atoms is called a meso compound.
Mesomer is an optically inactive compound whose molecule is superimposable on its mirror image in spite of the presence of chiral carbon atoms is called a meso compound.
