In the compound below, find the stereocenter, and label the four groups from 1 to 4 using the system of priorities based on atomic number.

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The four atoms attached to the stereocenter are C, C, Cl, and F. Of these, Cl has the highest atomic number, so it gets the first priority. Then comes F as number 2. We need to decide which carbon atom gets the number 3 and which carbon atom gets the number 4. We do this by listing the three atoms attached to each of them:

Left side : C, H, H Right side : C, C, H

So the right side wins. Therefore, the numbering goes like this :

structure

Ans. Cl = 1, F = 2, CH(CH₃)₂ = 3, CH₂CH₃ = 4

Chemistry - STEREO ISOMERISM Question with Solution | TestHub

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