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Rule
Example
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Position number of carbons is decided from left or right that gives lowest number for the attached functional group
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Butan-2-ol* vs butan-3-ol
https://lh7-us.googleusercontent.com/3yvDWdS-wpubiRRg1lwtuOtc7UrMztGMYuAMvwy4w_9RwP-Y_g4zWHhKI81xjhQICRQoZi_aGRm29d6PiahOkEs8rl-HsXLWak_0YeyqM2HvL8CQq9OCBWggZfy0XFf4sMDn2hm1TQ0EmD7XVwz7R4Q
For alkenes, alkynes position number is the lower of the 2 carbon atoms involved
Open
But-2-ene, but-2-yne
Some functional groups have to be at one end of molecule and cannot have position number
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