question_answer

The absolute configuration of : [JEE Main Solved Paper-2016 ]

A) (2R, 3R)                               

B) (2R, 3S)

C) (2S, 3R)                                

D) (2S, 3S)

Correct Answer: C

Solution :

For 2nd carbon the priority order a > b > c > d \[a=-OH\]                            \[\overset{\begin{smallmatrix}  -CH-C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{Cl}}\,\] \[=-C{{O}_{2}}H\]                            \[=-H\] For 3rd carbon \[a'=-Cl\]             \[b'=-\underset{\begin{smallmatrix}  | \\  OH \end{smallmatrix}}{\mathop{CH}}\,-C{{O}_{2}}H\] \[c'=-C{{H}_{3}}\]             \[d'=-H\]