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  4. When alcohol reacts with concentrated H2SO4, intermediate compound formed is :

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Q. When alcohol reacts with concentrated $H_{2}SO_{4},$ intermediate compound formed is :

AFMCAFMC 2005Alcohols Phenols and Ethers

Solution:

Conc. $H _{2} SO _{4}$ is an excellent dehydrating agent. Upon reaction with an alcohol it forms an alkene and water molecule is given out. First step involves protonation of alcohol.
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Which on dehydration forms carbonium ion.