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CBSE Class 12-science Answered

Can you explain the reaction? And, why isn't it butan-2-ol ?  
question image
Asked by akshitaasia | 12 Mar, 2018, 01:46: PM
answered-by-expert Expert Answer
Don't get confused between the elimination reaction and the substitution reaction.
The difference between both reactions is medium.
 
 
Case 1: If the medium is aqueous then,
 
straight R minus straight x space plus space KOH space rightwards arrow with aqueous on top space space space straight R minus OH space plus space KX
 
If the medium is aqueous then OH- will act as a nucleophile and the reaction will proceed via substitution to produce alcohol.
 
 
 
Case 2: If the medium is alcoholic then,
 
CH subscript 3 minus CH minus CH subscript 2 minus CH 3 space space plus space space KOH space space rightwards arrow with alcoholic on top space space space CH subscript 3 minus CH equals CH minus CH subscript 3 space space space space space space space space space space space space space straight I space space space space space space space space space space space space space Cl
 
If the medium is alcoholic then OH- ion will act as a base and abstract proton then reaction proceeds via elimination.
 
That's why it will not give butan-2-ol it will only give elimination product that is the alkene 
 
I hope now you will not confuse by both these reactions.
Answered by Ramandeep | 12 Mar, 2018, 03:57: PM

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