Write mechanism of the following reaction : C 2 H 5 OH → 443 K H 2 SO 4 CH 2 = CH 2 + H 2 O

Alcohols undergo dehydration (removal of a molecule of water) to form alkenes on treating with concentrated H 2 SO 4 . This is called elimination reaction. Mechanism: Step 1: Formation of protonated alcohol. Step 2: Formation of carbocation: It is the slowest step and hence, the rate determining step of the reaction. Step 3: Formation of ethene by elimination of a water molecule. The acid used in step 1 is released in step 3. To drive the equilibrium to the right, ethene is removed as it is formed.

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Ethoxide ion is a stronger base than hydroxide ion.

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Important Questions on Alcohols, Phenols and Ethers

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Chemistry>Organic Chemistry>Alcohols, Phenols and Ethers>Chemical Properties of Alcohols

The most suitable reagent for the conversion of

R - {CH}_{2} - OH \to R - CHO

is :

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Chemistry>Organic Chemistry>Alcohols, Phenols and Ethers>Chemical Properties of Alcohols

Which is the most suitable reagent for the following transformation?
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HARD

Chemistry>Organic Chemistry>Alcohols, Phenols and Ethers>Chemical Properties of Alcohols

In the following reaction sequence, the correct structure(s) of X is (are)

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Chemistry>Organic Chemistry>Alcohols, Phenols and Ethers>Chemical Properties of Alcohols

Which of the following compound will give positive iodoform test?

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Chemistry>Organic Chemistry>Alcohols, Phenols and Ethers>Chemical Properties of Alcohols

Out of t-butyl alcohol and n-butanol, which one will undergo acid catalyzed dehydration faster and why ?

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Chemistry>Organic Chemistry>Alcohols, Phenols and Ethers>Chemical Properties of Alcohols

The major product in the following reaction is

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Chemistry>Organic Chemistry>Alcohols, Phenols and Ethers>Chemical Properties of Alcohols

Consider the following reaction,

C_{2} H_{5} O H + H_{2} S O_{4} \to P r o d u c t

Among the following, which one cannot be formed as a product under any conditions?

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Chemistry>Organic Chemistry>Alcohols, Phenols and Ethers>Chemical Properties of Alcohols

An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution. It however, reacts with Grignard reagent and given positive iodoform test. The compound is:

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Chemistry>Organic Chemistry>Alcohols, Phenols and Ethers>Chemical Properties of Alcohols

The compound