Carboxylic Acid & Derivatives Test

Result

Carboxylic Acid & Derivatives Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Identify the major products P, Q and R in the following sequence of reaction :

A

B

C

D

Solution
Question 2
1 / -0

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their _________.

A
more extensive association of carboxylic acid via van der Waals force of attraction

B
formation of intramolecular H-bonding

C
formation of intermolecular H-bonding

D
formation of carboxylate ion

Solution

Carboxylic acids have higher boiling points than aldehydes, ketones, and given alcohol of comparable molecular mass. This is because of formation of intermolecular H-bonding.
Question 3
1 / -0

Acetyl chloride cannot be obtained by treating acetic acid with:

A
CHCl₃

B
PCl₃

C
PCl₅

D
SOCl₂

Solution

With chloroform acetyl chloride cannot be formed with acetic acid.
Question 4
1 / -0

Long chain carboxylic acids are called fatty acids because

A
the molecule is very fatty

B
the molecules were first found in natural fat

C
they have fattering effect

D
none of the above

Solution

Fats are esters of higher acids
Question 5
1 / -0

On treatment of citric acid with cone. H₂SO₄ which of the following is produced ?

A
Acetone

B
Dihydroxy acetone

C
Citraconic anhydride

D
None of these

Solution
Question 6
1 / -0

Which of the following is the correct order of relative strength of acids?

A
CICH₂COOH > BrCH₂COOH > FCH₂COOH

B
BrCH₂COOH > CICH₂COOH > FCH₂COOH

C
FCH₂COOH > CICH₂COOH > BrCH₂COOH

D
CICH₂COOH > FCH₂COOH BrCH₂COOH

Solution
Question 7
1 / -0

Which of the following is the weakest acid?

A

B
CH₃COOH

C
HCOOH

D

Solution

Alcohols are weaker acids than Carboxylic acid. Options (B), (C) and (D) are carboxylic acids, whereas option (A) is Phenol.
Question 8
1 / -0

Lactic acid on heating with dill. H₂SO₄ gives

A
Acetic acid

B
Propionic acid

C
Acrylic acid

D
Formic acid

Solution
Question 9
1 / -0

An organic compound is boiled with alcoholic potash. The product is cooled and acidified with HCl. A white solid separates out. The starting compound may be:

A
ethyl benzoate

B
ethyl formate

C
ethyl acetate

D
methyl acetate

Solution

The starting compound may be ethyl benzoate. When it is boiled with alcoholic potash, it is hydrolyzed to ethyl alcohol and potassium benzoate. The product is cooled and acidified with HCl. Potassium benzoate is converted to benzoic acid, a white solid which separates out.

C₆H₅COOK + HCl→C₆H₅COOH + KCl
Question 10
1 / -0

Consider the acidity of the carboxylic acids.

which of the following order is correct ?

A
(i)>(ii)>(iii)>(iv)

B
(ii)>(iv)>(iii)>(i)

C
(ii)>(iv)>(i)>(iii)

D
(ii)>(iii)>(iv)>(i)

Solution

Electron withdrawing group increases the acidity of benzoic acid, o - isomer will have higher acidity then corresponding m and p isomer due to ortho - effect. As M group (i.e. NO₂ ) at p -position have more pronounced electron withdrawing effect than as

– NO₂ group at m - position (–I effect)