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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
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What does r & s denotes in the question? and what should be its answer please tell.
Q.28 Of the given isomers of molecules I and II, the meso-form is CH:CH(Br)CH(C)CH I CH:CH(C)CH(C)CH3 II (A) (,R)-isomer of I (C) (R,S)-isomer of I (B) (R,S)-isomer of III (D) (S,S)-isomer of II
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Priyanshu kumar Best Answer
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The stereochemistry (e.g. R or S) is very crucial in determining whether it is a meso compound or not. As a meso compound is optically inactive, so their stereochemistry should cancel out. For instance, R cancels S out in a meso compound with two stereocentres.
You check only for IInd molecule as in 1st molecule plane of symmetry is not present in any case...So meso compound is only possible for IInd molecule having configuration :- RS or SR with two stereocentres.