ABC Chemistry – Best Chemistry Coaching in Dwarka, Delhi
Question 1
The configurations at the two stereocentres in the compound given below are:
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.
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:
Correct Answer: (b) Identical
Explanation:
A 180° rotation about the C–C bond converts one structure into the other. No bond breaking occurs, hence both represent the same molecule.
Explanation:
A 180° rotation about the C–C bond converts one structure into the other. No bond breaking occurs, hence both represent the same molecule.
