Ethanol reacts with conc. `H_(2)SO_(4)` at `0^(@)C` to yield

Options

A. ethylene
B. diethyl ether
C. ethyl hydrogen sulphate
D. ethyloxonium hydrogen sulphate

Answer

D

Explanation

`CH_(3)CH_(2)-underset(H)underset(|)ddotO: overset(conc.)underset(H_(2)SO_(4).0^(@)C)rarr [underset("Ethyloxonium hydrogen sulphate")(CH_(3)CH_(2)-underset(H)underset(|)ddotO^(+)-H)]HSO_(4)^(-)`
Ethyl hydrogen sulphate, `CH_(3)CH_(2)OSO_(2)OH`, is formed at room temperature `(25^(@)C)`
`CH_(3)CH_(2)O-H+HO - SO_(2) - OH overset(-H_(2)O)rarr CH_(3) CH_(2)OSO_(2)OH`
Diethyl ether is formed at `130^(@)C` from an intermolecular dehydration:
`CH_(3)CH_(2)O -H +HO - CH_(2)CH_(3) rarr CH_(3)CH_(2) - O - CH_(2) CH_(3)`
Ethylene is formed at `180^(@)C` froma n intramolecular dehydration which is favoured by higher temperature:
`underset(H)underset(|)(CH_(2))-underset(OH)underset(|)(CH_(2)) underset(-H_(2)O)rarr CH_(2) = CH_(2)`