explain in drtail

Solution -

According to Saytzeff rule, the alkene formed in greatest amount is the one that corresponds to removal of the hydrogen from the carbon having the fewest hydrogen substituents whereas according to Hoffmann rule when an elimination reaction which can produce two or more alkene (or alkyne) products, the product containing the less highly substituted pi bond is major product. Here in the first case due to the presence of less substituted base it favours Saytzeff alkene whereas in the presence of bulky base, the bulky base will react more quickly with the least sterically hindered proton on a beta-carbon, which results in formation of the least substituted alkene,i.e. Hoffmann alkene.
option A is correct 
 

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