Alcohol, Phenols and Ethers · Chemistry · COMEDK

Start Practice

MCQ (Single Correct Answer)

1
Choose the incorrect statement.
COMEDK 2025 Evening Shift
2

Identify $[\mathrm{X}]$ used in the given reaction.

$[\mathrm{X}]+$ Copper $/ 573 \mathrm{~K} \rightarrow[\mathrm{Y}]$

$[\mathrm{Y}] \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O} / \mathrm{H}^{+}]{\text {(i) } \mathrm{CH}_3 \mathrm{MgBr}}$ Tert.butyl alcohol. (major product)

COMEDK 2025 Evening Shift
3

What are the intermediates formed during the reactions $A$ and $B$ ?

A. Reimer-Tiemann reaction.

B. Dehydration of alcohols in the slow rate determining step.

COMEDK 2025 Evening Shift
4

Complete the following 2 reactions A \& B by choosing appropriate reactants $[\mathrm{X}] \&[\mathrm{Y}]$.

COMEDK 2025 Afternoon Shift Chemistry - Alcohol, Phenols and Ethers Question 5 English

COMEDK 2025 Afternoon Shift
5
Which one of the following compounds will give a yellow precipitate when reacted with $\mathrm{I}_2 / \mathrm{NaOH}$?
COMEDK 2025 Afternoon Shift
6

Two statements, One Assertion and the other Reason, are given.

Which one of the following is the correct option?

Assertion: The acid strength of 4 compounds in the descending order is p- Nitrophenol > p-Methoxyphenol > Phenol > p-chlorophenol.

Reason: Electron withdrawing groups increase the acid strength while Electron donating groups decrease the acid strength of Phenol and its derivatives.

COMEDK 2025 Afternoon Shift
7

Which one of the following is the major product formed when the given reaction occurs?

COMEDK 2025 Afternoon Shift Chemistry - Alcohol, Phenols and Ethers Question 6 English

COMEDK 2025 Afternoon Shift
8

Match the reaction in Column I with the major product formed given in Column II.

Column I - Reaction/conditions Column II - Product
A. COMEDK 2025 Afternoon Shift Chemistry - Alcohol, Phenols and Ethers Question 4 English 1 P. Pentan-2-ol
B. COMEDK 2025 Afternoon Shift Chemistry - Alcohol, Phenols and Ethers Question 4 English 2 Q. 2-Hydroxybenzoic acid.
C. COMEDK 2025 Afternoon Shift Chemistry - Alcohol, Phenols and Ethers Question 4 English 3 R. Phenol
D. COMEDK 2025 Afternoon Shift Chemistry - Alcohol, Phenols and Ethers Question 4 English 4 S. 2-Methylpropan-1-ol

COMEDK 2025 Afternoon Shift
9

Convert Benzene $\rightarrow 3$-Bromophenol by choosing appropriate reagents [(i) to (v)] in the correct sequence.

(i) $\mathrm{NaNO}_2 / \mathrm{HCl}\left(0^{\circ} \mathrm{C}\right)$

(ii) Conc. $\mathrm{HNO}_3 / \mathrm{H}_2 \mathrm{SO}_4$

(iii) $\mathrm{H}_2 \mathrm{O} / 283 \mathrm{~K}$

(iv) $\mathrm{Fe} / \mathrm{HCl}$

(v) $\mathrm{Br} 2 / \mathrm{Fe}$

COMEDK 2025 Morning Shift
10

What is the final product $[\mathrm{Z}]$ formed when the given reactions take place?

COMEDK 2025 Morning Shift Chemistry - Alcohol, Phenols and Ethers Question 9 English

COMEDK 2025 Morning Shift
11
Benzene diazonium chloride when warmed with water gives a compound, whose Sodium salt when reacted with Allyl bromide gives compound $[\mathrm{X}]$. Identify $[\mathrm{X}]$.
COMEDK 2025 Morning Shift
12

Cyclohexanol undergoes a series of reactions as given. Identify compound (iv).

$\mathrm{C}_6 \mathrm{H}_{11} \mathrm{OH}+\mathrm{CrO}_3 \rightarrow(\mathrm{i})+\mathrm{C}_6 \mathrm{H}_5 \mathrm{MgI} \rightarrow(\mathrm{ii})+$ dil. $\mathrm{HCl} \rightarrow(\mathrm{iii})+$ Conc. $\mathrm{H}_3 \mathrm{PO}_4 \rightarrow(\mathrm{iv})$

COMEDK 2025 Morning Shift
13

4 statements are given below. Identify the incorrect statement

A. Phenol has lower $$\mathrm{pK}_{\mathrm{a}}$$ value than $$\mathrm{p}$$-cresol

B. 2-Chlorophenol is more acidic than phenol

C. Ortho and para nitrophenols can be separated by steam distillation since $$\mathrm{p}$$-Nitrophenol is more steam volatile than o-Nitrophenol

D. Phenol on reaction with $$\frac{\mathrm{Cr}_2 \mathrm{O}_7^{2-}}{\mathrm{H}^{+}}$$ yields a conjugated diketone

COMEDK 2024 Evening Shift
14

Two statements, Assertion and Reason are given below. Choose the correct option.

Assertion: n-propyl tert-butyl ether can be readily prepared in the laboratory by Williamson's synthesis.

Reason: The reaction occurs by $$\mathrm{S}_{\mathrm{N}} 1$$ attack of Primary alkoxide on Tert-alkyl halide to give good yield of the product, n-propyl tert-butyl ether.

COMEDK 2024 Evening Shift
15

Compounds $$\mathrm{A}$$ and $$\mathrm{B}$$, having the same molecular formula $$(\mathrm{C}_4 \mathrm{H}_8 \mathrm{O})$$, react separately with $$\mathrm{CH}_3 \mathrm{MgBr}$$, followed by reaction with dil. $$\mathrm{HCl}$$ to form compounds $$\mathrm{X}$$ and $$\mathrm{Y}$$ respectively. Compound $$\mathrm{Y}$$ undergoes acidic dehydration in presence of Conc. $$\mathrm{H}_2 \mathrm{SO}_4$$ much more readily than $$\mathrm{X}$$. Compound $$\mathrm{Y}$$ also reacts with Lucas reagent, much more readily than $$\mathrm{X}$$, with appearance of turbidity. Identify $$\mathrm{X}$$ and $$\mathrm{Y}$$.

COMEDK 2024 Evening Shift
16

The major product '$$\mathrm{X}$$' of the following reaction is

COMEDK 2024 Afternoon Shift Chemistry - Alcohol, Phenols and Ethers Question 16 English

COMEDK 2024 Afternoon Shift
17

Which of the following tests may be used to distinguish between phenol and cyclohexanol?

COMEDK 2024 Afternoon Shift
18

Arrange the following compounds in the decreasing order of their acidic strength.

(I) m-cresol

(II) Phenol

(III) m-aminophenol

(IV) m-methoxyphenol

COMEDK 2024 Afternoon Shift
19

Which of the following compound cannot be prepared by Williamson's synthesis?

COMEDK 2024 Afternoon Shift
20

An organic compound $$[\mathrm{A}]\left(\mathrm{C}_5 \mathrm{H}_{12} \mathrm{O}\right)$$, on reaction with conc. $$\mathrm{H}_2 \mathrm{SO}_4$$ at $$443 \mathrm{~K}$$ gives $$[\mathrm{B}]$$ as one of the products. Compound [B] undergoes further reaction with $$\mathrm{O}_3$$ and $$\mathrm{Zn} / \mathrm{H}_2 \mathrm{O}$$ to give Propanone and Ethanal as products. Identify compound [A]

COMEDK 2024 Morning Shift
21

Match the compounds given in column I with the corresponding most stable Carbocations formed by each, as given in Column II, when they undergo acidic dehydration in presence of Conc. $$\mathrm{H}_2 \mathrm{SO}_4$$.

No. Column I No. Column II
A 2-Methylbutan-1-ol P $${(C{H_3})_2}\mathop C\limits^ + - CH{(C{H_3})_2}$$
B Butan-2-ol Q $$C{H_3} - C{H_2} - C{H_2} - \mathop C\limits^ + {H_2}$$
C 3, 3-Dimethylbutan-2-ol R $${(C{H_3})_2}\mathop C\limits^ + - C{H_2} - C{H_3}$$
D Butan-1-ol S $$C{H_3} - \mathop C\limits^ + H - C{H_2} - C{H_3}$$

COMEDK 2024 Morning Shift
22
COMEDK 2023 Morning Shift Chemistry - Alcohol, Phenols and Ethers Question 25 English
COMEDK 2023 Morning Shift
23

Identify the starting compound from the following data:

$$\mathrm{C}_6 \mathrm{H}_{14} \mathrm{O}(\mathrm{X})$$ on reaction with $$\mathrm{HI}$$ yields a haloalkane (A) and an alcohol (B). Compound (A) on reaction with aqueous $$\mathrm{NaOH}$$ gives an alcohol (C). Compounds (B) and (C) on reaction with $$\mathrm{CrO}_3$$ in anhydrous medium yields Butanone and Ethanal respectively.

COMEDK 2023 Evening Shift
24

Choose the incorrect statement.

COMEDK 2023 Evening Shift
25

Choose the correct order of increasing acidic strength of the following compounds.

COMEDK 2023 Evening Shift
26

The chemical formula of Lucas reagent is

COMEDK 2022
27

Which of the following is a false statement?

COMEDK 2022
28

The major product in the given reaction is

COMEDK 2022 Chemistry - Alcohol, Phenols and Ethers Question 26 English

COMEDK 2022
29

Denatured alcohol is

COMEDK 2020
EXAM MAP