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Strength of Acids and Bases

A Arrange the...

Question

(A) Arrange the following carboxylic acid in ascending order of their acidity.
$p-nitro benzoic acid, p-methoxy benzoic acid, and$ $benzoic acid$
(B) How will you distinguish between Aldehyde and Ketone by chemical test?

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Solution

(A) Acidic strength order . refer image
(B) Due to reducing action aldehyde gives Tollen's test while ketone not
$R - O | | C - H A g N O_{3} + N H_{4} O H - ---------- \to (T o l l e n^{'} s r e a g e n t) - R - O | | C - O H + A g$
Its also known as silver mirror test.

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Q. a) Give resonating structure of carboxylic group?
b) Give chemical reaction to obtain the following.
i) Carboxylic acid from Grignard reagent.
ii) Benzoic acid from ethyl benzoate.
iii) Benzamide from benzoic acid.
c) Give resonating structures of propenoic acid?
d) How will you distinguish aldehyde, ketone & carboxylic 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

\to

Ethanoic acid
(ii) Benzamide

\to

Benzoic acid
(iii) Benzaldehyde

\to

Meta-nitrobenzaldehyde.

Q. Aldehydes, Ketones and Carboxylic acids are Carbonyl compounds.
(a) Aldehydes differ from Ketones in their oxidation reactions. Illustrate with one example.
(b) How will you prepare benzaldehyde by Gatterman-Koch reaction?
(c) Write the reactions of carboxylic acid with the following reagents. (Write the chemical equations)
(i) Thionyl chloride

(S O {C l}_{2})

(ii) Chlorine in presence of small amount of red phosphorous.
(iii) Lithium Aluminium hydride

(L i A l H_{4})

Q. Wrie chemical test to distinguish between aldehyde and ketone (Give reason).

Q. (a) Give chemical tests to distinguish between :
(i) Propanol and propanone
(ii) Benzaldehyde and acetophenone
(b) Arrange the following compounds in an increasing order of their property as indicated:
(i) Acetaldehyde, acetone, methyl tertbutyl ketone (reactivity towards

H C N

)
(ii) Benzoic acid, 3,4-dinitrobenzoicacid, 4-methoxybenzoic acid (acid strength)
(iii)

C H_{3} C H_{3} C H (B r) C O O H, C H_{3} C H (B r) C H_{2} C O O H, (C H_{3})_{2} C H C O O H

(acid strength)

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