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Chemical Science Exams Question – CSIR NET 2011

Question 1 The configurations at the two stereocentres in the compound given below are: (a) 1R,4R (b) 1R,4S (c) 1S,4R (d) 1S,4S Submit Correct Answer: (a) 1R,4R Explanation: The substituents at each chiral centre are numbered according to the CIP priority rules. The atom with the highest atomic number is assigned the highest priority. After orienting the lowest priority group away from the observer, the sequence of remaining substituents is traced. Both stereocentres show a clockwise arrangement, leading to R-configuration at positions 1 and 4. Question 2 CSIR-NET The two compounds given below are: (a) Enantiomers (b) Identical (c) Diastereomers…

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