Organic Chemistry Basics 1 Question 6
6. The absolute configuration of
(2016 Main)
(a) $(2 \mathrm{~S}, 3 \mathrm{R})$
(b) $(2 \mathrm{~S}, 3 \mathrm{~S})$
(c) $(2 \mathrm{R}, 3 \mathrm{R})$
(d) $(2 \mathrm{R}, 3 \mathrm{~S})$
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Answer:
Correct Answer: 6. (c)
Solution:
6.
For $\mathrm{C}-2$, order of priority of substituents is $\mathrm{OH}>\mathrm{CH}(\mathrm{Cl})\left(\mathrm{CH}_{3}\right)>\mathrm{COOH}$
For $\mathrm{C}-3$, order of priority of substituents is $\mathrm{Cl}>\mathrm{CH}(\mathrm{OH}) \mathrm{COOH}>\mathrm{CH}_{3}$
Hence, according to CIP rules,
