1) When a mixture of CH3Br and C2H_Br is treated with sodium metal in dry ether as solvent,
then product formed is
a) CH3CH2CH2CH3 b) CH3CH2CH3
c) C2H6
d) a mixture of all of these
Answers
Answer:
ANSWER
(i)
(a) When methyl bromide is treated with sodium metal in presence of dry ether, coupling takes place to give ethane. Reaction is known as Wurtz's reaction and also called as coupling reaction of alkyl halide.
CH
3
Br
Na,ether
CH
3
−CH
3
Thus, X is CH
3
CH
3
.
(b)The reaction of ethane with bromine called a substitution reaction.
CH
3
−CH
3
Br
2
hν
CH
3
CH
2
Br
Thus, Y is CH
3
CH
2
Br.
(c) Next reaction is also Wurtz's reaction and will form butane.
CH
3
CH
2
Br
Na,ether
CH
3
−CH
2
−CH
2
−CH
3
Thus, Z is CH
3
CH
2
CH
2
CH
3
.
(ii)
(a) When NaOH added to acetic acid, they react to form sodium acetate and water. This is a typical acid + base neutralization reaction.
CH
3
COOH
NaOH
CH
3
COONa+H
2
O
Thus, X is CH
3
COONa.
(b) When sodium acetate is treated with soda lime, decarboxylation takes place and CO
2
is eliminated from the sodium acetate.
CH
3
COONa
NaOH
CaO
CH
4
+Na
2
CO
3
Thus, Y is CH
4
.
(c) This reaction between methane and bromine happens in the presence of ultraviolet light - typically sunlight. This is a good example of a photochemical reaction.
CH
4
Br
2
hν
CH
3
Br+HBr
Thus, Z is CH
3
Br
Explanation:
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