Carboxylic Acids and Its Derivatives · Chemistry · COMEDK

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MCQ (Single Correct Answer)

1
An organic compound $[\mathrm{X}]$ (Molecular formula $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_2$ ) reacts with dil. $\mathrm{H}_2 \mathrm{SO}_4$ to form an alcohol [B] and a carboxylic acid [C]. Reaction of compound $[\mathrm{B}]$ with Jones reagent yielded compound $[\mathrm{C}]$. When compound $[\mathrm{C}]$ was heated with $\mathrm{P}_2 \mathrm{O}_5$ an Anhydride was formed. Compound $[\mathrm{X}]$ is ------------- --
COMEDK 2025 Evening Shift
2

Identify X and Y formed in the following two reactions.

(i) Decan-1-ol $\xrightarrow{\text { Jones reagent }} \mathrm{X}$

(ii). Sodium salt of $\mathrm{X} \xrightarrow{\mathrm{NaOH} / \mathrm{CaO}, \Delta} \mathrm{Y}$

COMEDK 2025 Afternoon Shift
3
Choose the incorrect statement from the following.
COMEDK 2025 Afternoon Shift
4
An organic compound $[\mathrm{X}]$ reacts with $\mathrm{H}_2 / \mathrm{Pd}-\mathrm{BaSO}_4$ to give compound $[\mathrm{Y}]$ which reduces Tollen's reagent and undergoes Cannizzaro's reaction. On rigorous oxidation of $[\mathrm{Y}]$ in presence of $\mathrm{KMnO}_4 / \mathrm{H}^{+}$Phthalic acid is the product obtained. What is $[\mathrm{X}]$ ?
COMEDK 2025 Morning Shift
5

Two statements, one Assertion (A) and the other Reason (R) are given. Choose the correct option.

Assertion: 2-aminoethanoic acid and p-aminobenzene sulphonic acid can exist as Zwitter ions while p-aminobenzoic acid cannot.

Reason: When the acid group is a relatively strong proton donor and the $-\mathrm{NH}_2$ group is sufficiently basic it can accept a $\mathrm{H}^{+}$ion from the acid group to form the dipolar ion.

COMEDK 2025 Morning Shift
6

Two statements, One Assertion [ A ] and the other Reason [ R ] are given. Identify the correct option

Assertion $[A]$ : The decreasing order of the acidic character of the following is $B>D>A>C$

COMEDK 2025 Morning Shift Chemistry - Carboxylic Acids and Its Derivatives Question 4 English

Reason $[\mathbf{R}]$ : Fluorine has larger -I effect than Cl and Br .

COMEDK 2025 Morning Shift
7

Identify the final product formed when Benzamide undergoes the following reactions:

COMEDK 2024 Evening Shift Chemistry - Carboxylic Acids and Its Derivatives Question 7 English

COMEDK 2024 Evening Shift
8

Identify the final product $$[\mathrm{D}]$$ formed when Benzyl alcohol undergoes the following series of reactions

$$\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{OH}+\mathrm{SOCl}_2 \rightarrow[\mathrm{A}]+\mathrm{KCN} \rightarrow[\mathrm{B}]+\mathrm{H}_3 \mathrm{O}^{+} \text {(partial hydrolysis) } \rightarrow[\mathrm{C}]+\mathrm{H}_3 \mathrm{O}^{+} \text {(complete hydrolysis) } \rightarrow[\mathrm{D}]$$

COMEDK 2024 Evening Shift
9

In a set of reactions, bromoethane yielded a final product 'S'.

COMEDK 2024 Afternoon Shift Chemistry - Carboxylic Acids and Its Derivatives Question 10 English

The compound 'S' should be

COMEDK 2024 Afternoon Shift
10

Among the following compounds, the most acidic is :

COMEDK 2024 Afternoon Shift
11

4-methyl benzamide (A) on reaction with ethanolic solution of $$\mathrm{KOH}$$ and bromine gives another compound (B). The compound (B) on treatment with benzoyl chloride gives compound (C). Identify the correct structure of compound (C) from the following.

COMEDK 2024 Afternoon Shift
12

A sweet smelling organic compound $$[\mathrm{A}]\left(\mathrm{C}_9 \mathrm{H}_{10} \mathrm{O}_2\right)$$ undergoes acid hydrolysis to form an acid [B].
Compound [B] further reacts with Ammonia followed by heating to yield [C].
Compound $$[\mathrm{C}]$$ when reacted with $$\mathrm{Br}_2$$ in caustic potash gave compound $$[\mathrm{D}]\left(\mathrm{C}_6 \mathrm{H} 7 \mathrm{~N}\right)$$ which gives a white precipitate with aqueous $$\mathrm{Br}_2$$.
Identify compounds $$[\mathrm{A}]$$ & $$[\mathrm{D}]$$

COMEDK 2024 Morning Shift
13

Identify the product [D] formed when Reactant [A] $$(M M 78 \mathrm{~g} / \mathrm{mol})$$ undergoes the series of reactions shown

COMEDK 2024 Morning Shift Chemistry - Carboxylic Acids and Its Derivatives Question 12 English

COMEDK 2024 Morning Shift
14

Which of the following compounds would not be expected to decarboxylate when heated?

COMEDK 2023 Morning Shift
15

Which one of the following correctly represents the decreasing order of acidic nature of the given carboxylic acids:

[A] 2-Hydroxybenzoic acid

[B] Benzoic acid

[C] 3-Hydroxybenzoic acid

[D] 4- Hydroxybenzoic acid

COMEDK 2023 Evening Shift
16

Why, ketones and carboxylic acids have higher boiling point as compared to aldehydes?

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