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Describe saytzeffs rule

Describe saytzeff’s rule in brief?

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The formation of Alkenes by the dehydration of alcohols (employing concentrated H2SO4) the hydrogen atom will be eliminated (to eliminate as water) from the adjacent carbon atom joined to the less number of hydrogen atoms.

Example: In the dehydration of Butane-2Ol
2-Butane is made

CH3-CH=CH-CH3+H2O and concentrated H2SO4 and CH3-CH2-CH-CH3

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