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Byju's Answer
Standard XII
Chemistry
Cross Aldol Condensation
i Write Hell ...
Question
(i) Write Hell - Volhard - Zelinsky reaction.
(ii) Write cross - aldol condensation.
(iii) Ethanoic acid is weaker acid than benzoic acid. Why?
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Solution
(
i
)
HVZ reaction: Refer IMAGE
01
(
i
i
)
Cross-aldol condensation: Refer IMAGE
02
(
i
i
i
)
Ethanoic acid is weaker than Benzoic acid: because aryl groups are more electrons withdrawing groups than aliphatic group.
Hence, Ethanoic acid is weaker acid.
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Similar questions
Q.
Benzoic acid is stronger than methanoic acid but weaker than ethanoic acid.
Q.
How will you convert the following in not more than two steps:
(i) Benzoic acid to Benzaldehyde
(ii) Acetophenone to Benzoic acid
(iii) Ethanoic acid to
2
- Hydroxyethanoic acid
Q.
(a) Write a test to distinguish between aldehydes and ketones.
(b) How will you prepare benzaldehyde by Etard's reaction?
(c) How will you bring about the following conversions? (Write the chemical equations)
(i) Ethanol
→
Ethanoic acid
(ii) Benzamide
→
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(iii) Benzaldehyde
→
Meta-nitrobenzaldehyde.
Q.
(a) Account for the following:
(i)
C
H
3
C
H
O
is more reactive than
C
H
3
C
O
C
H
3
towards reaction with
H
C
N
.
(ii) Carboxylic acid is a stronger acid than phenol.
(b) Write the chemical equations to illustrate the following name reactions:
(i) Wolff-Kishner reduction
(ii) Aldol condensation
(iii) Cannizzaro reaction
Q.
Write the formulae of (a) methanoic acid, and (b) ethanoic acid.
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