Answer:
(a) (i)
Ethanol to acetone
[1]
(ii)
Benzene to acetophenone
(iii)
Benzoic acid to benzaldehyde
(b) (i)
Decarboxylation When sodium salt of a
carboxylic
acid is heated with sodalime, hydrocarbon is formed by loss of carbon
dioxide. It is called decarboxylation. Through it, carbon chain can be degraded
[1]
(ii)
Cannizzaro reaction Aldehydes without
react
with concentrated NaOH to give an acid salt by oxidation and an alcohol by
reduction. Thus disproportionate of aldehyde takes place. This is called
Cannizzaro reaction.
Benzaldehyde,
without
also show
this reactions [1]
Or
(a)
[1]
Empirical
formula
%
Mol
Molar ratio
C
H
O
69.77
11.63
18.60
5.81
11.63
1.1625
5
10
0
Empirical
formula weight = 60 +10 +16
=86
Molar mass
=86
Thus
molecular formula
It does not
reduce Tollen's reagent: CHO absent It forms bisulphite complex : keto group
Thus, A
is
[1]
(b) (i)
(/_) effect
of the two Cl-atoms stabilises the
to a
greater extent as compared to (/_) (/_) effect of one CI-atom. Thus
is weaker
than
.
[1]
(ii)
(A) is
stabilised by resonance in
only
On the other
hand
ionises
is
stabilised in
as
well as in
.
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