A rotation of 120° about the axis perpendicular to the molecular plane through B makes BF 3 reappear : n = 360/120 = 3, therefore Cn = C 3 axis. (Each B-F bond is also a C 2 axis; the axis with the higher n is the main axis.)

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Chemistry - STEREO ISOMERISM Question with Solution | TestHub

ChemistrySTEREO ISOMERISMMiscellaneous/MixedEasy2 minQB

ChemistryEasysingle choice

BF₃

structure

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Solution:

A rotation of 120° about the axis perpendicular to the molecular plane through B makes BF₃ reappear : n = 360/120 = 3, therefore Cn = C₃ axis. (Each B-F bond is also a C₂ axis; the axis with the higher n is the main axis.)

Stream:JEESubject:ChemistryTopic:STEREO ISOMERISMSubtopic:Miscellaneous/Mixed

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