Question

how many sterioisomers does 2,3-butanediol have?

Answer 1

Ans:- 2,3- butanediol have three stereoisomers ,a meso compound and chiral pairs which is drawn in the picture below

Ans OH OH CH₂ - CH - CH - Colz. 2, 3 - butanediol. It can be drawn as- CHE Ho-c-h Hour 2 4 R Hoe - H - HOT H7 its CH₂ CA To assign R and s nomenclature we need to number the groups according to Cap rule. » Atom with higher mass is giron the priority & If two same atoms are attached, then priority is given based on subsequent atoms attached to the group. The least priority group should be present on the vertical line otherwise if he get R on sotation according to priority then it becomes Is and vice vetsa.

it clockwise, least prior group '4' on restical line hence R 1 I-453, antielekwice , least pion gheup 4'on vertical line hence is & Clockwise, least prior group 4 on horizontal live hence 8 and similarly if sotation is anticlowise and least prior group on horizontal line than R The three stereoisomers are - C CH3 CH2 o f R H H S OH HO- HO S H H OH Ho - CH Meso compound CH CH2 Enantiomers : (non-superimposable missor inage).