Chemistry - STEREO ISOMERISM Question with Solution | TestHub
ChemistrySTEREO ISOMERISMCALCULATION OF TOTAL STEREOISOMERSHard2 minQB
ChemistryHardsingle choice
(i) Total stereoisomers of 2,3-di-chloropentane are (a).
(ii) CH3-CH=CH-CHCl-CH=CH-CH2-CH3
Total number of stereocentre in given compound are (b). Value of a + b will be.
Options:
Answer:
D
Solution:
(i) 2,3-Dichloropentane, CH3-CHCl-CHCl-CH2-CH3, has two non-equivalent stereocentres (the two ends differ), so a = 22 = 4 (no meso form).
(ii) In CH3-CH=CH-CH(Cl)-CH=CH-CH2-CH3 the carbinyl carbon (CH-Cl) is one stereocentre, and each double bond is stereogenic (each alkene carbon bears two different groups), contributing two stereocentres each: b = 1 + 2 + 2 = 5.
a + b = 4 + 5 = 9.
Ans. (D) 9.
Stream:JEESubject:ChemistryTopic:STEREO ISOMERISMSubtopic:CALCULATION OF TOTAL STEREOISOMERS
⏱ 2mℹ️ Source: QB
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