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Molecules and Atomicity

In case of R,...

Question

In case of R, S configuration the group having highest priority is?

A

- N O_{2}

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B

- N H_{2}

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C

- C N

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D

- O H

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Solution

The correct option is D $- O H$
In case of R, S configuration the group having highest priority is $- O H$ . O has higher atomic number than N and C. Hence, oxygen has highest priority.

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Similar questions

Q. In assigning R-S configuration which among the following groups has highest priority ?

Q. Which among the following functional group has given the highest priority while assigning R-S configuration?

Q. Which among the following functional groups has been given the highest priority while assigning

R - S

Q. The decreasing order of priority for the following functional groups is:
I.

R - O H

R - C \equiv C - R

R - O - R

R - N H_{2}

Q. 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:

C l > C H_{2} C H_{3} > C H_{3} > H; C H_{2} C l > C H_{2} C H_{3}, C H_{2} C H_{2} C l > C H_{3}

Which of the above compounds have S configuration?

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