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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Priyanshu kumar
first breaks the multiple bonds and then the attachment of chiral carbon...Here 1st priority is given for top group as the chiral carbon is attached to carbon which is directly attached to 3 carbon but in all other 3 group attached the carbon is attached to 2 carbon and 1 hydrogen. Likewise you determine priority and clockwise rotation gives R and anticlockwise gives S