During dehydration of alcohols to alkenes by heating with concentrated  H_2SO_4 the initiation step is

  • Option 1)

    protonation of alcohol molecule

  • Option 2)

    formation of carbocation

  • Option 3)

    elimination of water

  • Option 4)

    formation of an ester.

 

Answers (1)

As we learnt in 

Dehydration of alcohols -

Ease of dehydration

3^{\circ}>2^{\circ }>1^{\circ }

- wherein

CH_{3}CH_{2}OH+Conc.H_{2}SO_{4}\overset{443K}{\rightarrow}CH_{2}=CH_{2}+H_{2}O

 

 The first step is protonation of alcohol by the acid.


Option 1)

protonation of alcohol molecule

This option is correct

Option 2)

formation of carbocation

This option is incorrect

Option 3)

elimination of water

This option is incorrect

Option 4)

formation of an ester.

This option is incorrect

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