[3 Mark Question Answer]

Question 13 Marks

How does ethanol reacts with
(a) Metallic sodium
(b) Acetic acid
(c) Conc.$H_2S0_4$

Answer

Ethanol reacts as follows
(a) Metallic sodium:
$2 C _2 H _5 OH +2 Na \longrightarrow 2 C _2 H _5 ONa + H _2$
(b) Acetic acid:
$C _2 H _5 OH + CH _3 COOH \stackrel{ concH _2 SO _4}{\rightleftharpoons} CH _3 COOC _2 H _5+ H _2 O$
(c) Conc. $H _2 SO _4$
$C _2 H _5 OH \xrightarrow[170^{\circ} C ]{\text { conc } \cdot H _2 SO _4} CH _2= CH _2+ H _2 O$

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Question 23 Marks

Give the necessary conditions and equations of getting ethanol from:
(a) Alkyl halide
(b) An ethene

Answer

Necessary conditions and equations of getting ethanol from the following are:
(a) Alkyl halide: alkyl halide on hydrolysis with dilute alkali give alcohol
$
C _2 H _5 Br + KOH ( aq ) \longrightarrow C _2 H _5 OH + KBr
$
(b) An ethene: Ethene is first treated with concentrated sulphuric acid at $80^{\circ} C$ when ethyl hydrogen sulphate is formed. Ethyl hydrogen sulphate on hydrolysis with boiling water or steam yield ethanol.
$
CH _2= CH _2+ H _2 SO _4 \xrightarrow[30 abm ]{80^{\circ} C } CH _3 CH _2 HSO _4
$
$
CH _3 CH _2 HSO _4+ HOH \xrightarrow{\text { boiling }} CH _3 CH _2 OH + H _2 SO _4
$

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Chemistry [3 Mark Question Answer]

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