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 convert propanol to propan-2-ol....show steps!

Two steps are involved in this conversion:

1. Dehydration of Propan - 1 - ol: Here, concentrated Sulphuric acid is used as the dehydrating agent.

CH3 - CH2 - CH2 - OH -conc. H2SO4-> CH3 - CH = CH2

2. Hydration of the alkene: The obtained propene is treated with H2O (in presence of acid as a catalyst), which gets added to the alkene, according to Markovnikov's rule [ the negative part of the addendum (here, - OH- of H2O) gets added to the Carbon atom with less number of Hydrogen atom ] ,  to get propan - 2 - ol.

CH3 - CH = CH2 -H2O-> CH3 - CH (OH) - CH3

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1. Dehydration of 1-propanol


. . . . . . . . . . . . . . . . . . . . . .(H2SO4)
CH3 - CH2 - CH2 - OH . . . -----------> . . CH3 -CH = CH2 + H2O
. . . 1-propanol . . . . . . . . . . . . . . . . . . . . . . . . propene



2 ) Hydration of propene


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (Cr2O7(2-))
CH3 - CH = CH2 - OH . . . + . . . H2O . . . ---------------> . . CH3 -CHOH - CH3
. . . . . propene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-propanol


The Markovnikov rule allows us to predict at what carbon atom attaches the hydrogen of H2O : the hydrogen atom attaches to the less substituted carbon atom (the most stable carbocation formation).

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