Dehydration of n butyl alcohol gives 2 butene as the main product why
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In the question you yourself has given the answer.The only point is 1-butanol gives but-1-ene as normal product and 2-butene on rearrangement of carbocation (from primary to secondary).
CH3CH2CH(OH)CH3 ---> Here dehydration can occur from both sides i.e. loss of H-OH can occur from left and right sides through underlined hydrogens giving both 2-butene and 1-butene.
Explanation:
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