12) Which of the following islare eptically lnactive chiral compound enantiomers

Question

12) Which of the following islare eptically lnactive chiral compound enantiomers E3) 3dentify the Solewing compounds as or 14) What is the relationship between the following compounds? 14 A) enantiomers 11) superimposable without bond rotatiorn C) constitutional isomens D) confornmational isemers b) diastereomers 15) Which of the following is a true statement? 15) A) All molecules which possess two or more chirality centers will be chirai B) All chiral molecules possess a plane of symmetry C) All achiral molecules are meso. D) All molecules which possess a single chirality center ol the S coefigurntion ane levorotabory E) A mixture of achiral compounds will be optically inactive. 16) How many stereoisomers exist with the following basic connectivity? 16) BrCH2CH(CHsXCH2CH3 A) 0 B) 1 C)2 0) 4 E 8 17 17) The specific rotation of a pure substance is -5,90°. What is the percentage of this isomer in a mixture with an observed specific rotation of -2.95? C)25% D)0% E)80% A)50% B) 75%

Explanation / Answer

12) Optical activity is related to rotation of plane polarised light toward clockwise or counterclockwise direction. To be optically active the compound must satisfy the following criteria

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