JEE Main · 2008 · 27 Apr 2008 · Offline · General Organic Chemistry

The absolute configuration of

is

(A) $S, S$
(B) $R, R$ ✓ Correct
(C) $R, S$
(D) $S, R$

Answer: (B)

Solution

Assigning configurations with the Cahn--Ingold--Prelog rules, one ranks the four groups on each stereocentre by atomic number and then checks whether the sequence from highest to lowest priority runs clockwise or anticlockwise with the lowest-priority group pointing away. Carrying this out at both stereocentres of the molecule shown, each turns out to be clockwise, so both centres are of

R

configuration, giving the

R, R

assignment.

JEE Main · 2008 · 27 Apr 2008 · Offline · Single correct option

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