Carboxylic Acid & Derivatives Test

Result

Carboxylic Acid & Derivatives Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

CH₃CO₂C₂H₅ on reaction with sodium ethoxide in ethanol gives A, which on heating in the presence of acid gives B. Compound B is

A
CH₃COCH₂COOH

B
CH₃COCH₃

C

D

Solution
Question 2
1 / -0

Select the pK_a value of the strongest acid from the following.

A
1.0

B
3.0

C
2.0

D
4.5

Solution

pK_a known as acid dissociation constant which define the acidic strength of any acid. Higher the pK_a value weaker the acid.

Thus, pK_a= 1 will be strongest acid among all
Question 3
1 / -0

Read the following statement and explanation and answer as per the options given below :-

Statement: Acetate ion is more basic than the methoxide ion.

Explanation: The acetate ion is resonance stabilized.

A
Both S and E are true but E is the correct explanation of S.

B
Both S and E are true but E is not the correct explanation of S.

C
S is true but E is false.

D
S is false but E is true.

Solution

Acetic acid is more acidic than methanol so acetate ion is less basic than methoxide ion. Also acetate ion is resonanse stabilized so why acetic acid is more acidic.
Question 4
1 / -0

Indicate the organic structure for product expected when 2-methylpropene is heated with acetyl chloride in the presence of anhydrous ZnCl₂.

A

B

C

D

Solution
Question 5
1 / -0

The product of the following reaction is

A
Ethyl ethanoate

B
Formic acid

C
CO and H₂O

D
Ethanoic anhydride

Solution
Question 6
1 / -0

For hydrolysis of the following functional groups, the decreasing order of reactivity is

A
RCOOR > RCONH₂ > RCOCl

B
RCOOR > RCOCl > RCONH₂

C
RCOCl > RCONH₂ > RCOOR

D
RCOCl > RCOOR > RCONH₂

Solution

The reactivity order of acid derivatives is based on nature of leaving group, resonance and inductive effect
Question 7
1 / -0

Read the assertion and reason carefully to mark the correct option out of the options given below :

Assertion : Trichloroacetic acid is stronger than acetic acid.

Reason : Electron withdrawing substituents decrease the activity.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion

B
If both assertion and reason are true but reason is not the correct explanation of the assertion

C
If assertion is true but reason is false.

D
If the assertion and reason both are false.

Solution

Trichloro acetic acid is stronger than acetic acid because the electron withdrawing group withdraw electrons from the carboxylate base and thus increasing the acid strength.
Question 8
1 / -0

CH₃CHO + H₂NOH → CH₃-CH = N -OH .... The above reaction occurs at

A
pH = 1

B
pH = 4.5

C
pH = 12

D
any value of pH

Solution

In highly acidic medium NH₂OH forms salts with acidic molecule and loses its capacity to acts as nucleophile
Question 9
1 / -0

Oxalic acid may be distinguished from tartaric acid by :

A
NaHCO₃

B
ammoniacal silver nitrate

C
litmus paper

D
phenolphthalein

Solution

Oxalic acid may be distinguished from tartaric acid by ammoniacal silver nitrate (Tollen's reagent).

This is silver mirror test, used for the detection of aldehydes and ketones.
Question 10
1 / -0

The - COOH group in a carboxylic acid can be replaced by H by heating the acid with :

A
Zn with HCl

B
H₂ in presence of nickel

C
soda lime

D
bromine and concentrated aqueous alkali

Solution

Soda lime decarboxylation reaction can be used to remove the COO part of the COOH group