43. Which compound is least acidic ? 1. Benzoic acid 2. o-chloro benzoic acid 3. o-methyl benzoic acid 4. o-nitro benzoic acid

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Q. Arrange benzoic acid, 4-methyl benzoic acid and 4-nitrobenzoic acid in increasing order of their acidic strength.

Q. The correct increasing order of the acid strength of benzoic acid (I),

4 -

nitrobenzoic acid (II),

3, 4 -

dinitro benzoic acid (III) and

4

- methoxy benzoic acid (IV) is:

Arrange the following compounds in increasing order of their property as indicated :

Acetaldehyde, acetone, di-tert-butyl ketone, methyl torl-butyl ketone (reactivity towards HCN).

$C H_{3} C H_{2} C H (B r) C O O H, C H_{3} C H (B r) C H_{2} C O O H, (C H_{3})_{2} C H C O O H, C H_{3} C H_{2} C H_{2} C O O H {(a c i d s t r e n g t h)}$

Benzoic acid, 4 - nitrobenzoic acid, 3, 4 - dinitro benzoic acid, 4 - methoxy benzoic acid (acid strength).

Q. (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?

Q. How many mono nitro-derivatives does para-chloro benzoic acid give on nitration?

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