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Answer:
(a)
Thus, (A) is
Properties
Conclusion
(A) from 2, 4,-DNP derivatives
(A) Has carbonyl group
(A) reduces Tollen's reagent
Carbonyl group is ?CHO
(A) gives Cannizzaro reaction
(A) Has-CHO group attached to
without
any H
(A)gives, 1,2-benzene dicarboxylic acid
(A)Has benzene nucleus with ?CHO group and alkyl group
in 1,2-position
Since, (A) is
Hence, R. is
(by
difference)
(A) is
Reactions
[3]
lodoform test
(i)
Phenol
Benoic acid
(p)
Add neutral
solution
Add
solution
Violet colour
Buff coloured ppt
(q)
Add
No reaction
Brisk [1]
Effervescence
(ii)
Benzaldehyde
Acetophenone
(p)
Iodoform test with
No yellow ppt
Yellow ppt of
(p)
Tollen's reagent test
Silver mirror is formed
No reaction [1]
Silver mirror test
Or
(a)
(i)
(ii)
[1]
(iii)
(b) (i) Aldehydes and ketones with at least one
condenses
in presence of base forming a product having ?OH and carbonyl group. This product
is called aldol and reaction is called aldol condensation.
Aldol on heating changes to enol. [1]
(ii) Stephen reaction Nitriles can be converted
aldehydes by reduction using
This is called Stephen reaction.
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