Alcohols, Phenols & Ethers PYQs Set 1 (PDF)

Set 1 of 14 · Questions 1-30 of 396

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions

NEET Chemistry · Alcohols, Phenols & Ethers · Set 1 (Q1-30)

Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.

1.
A better reagent to oxidize primary alcohols into aldehyde is
1. (1) $PCC$
2. (2) $alkaline KMnO_{4}$
3. (3) $acidified K_{2} Cr_{2} O_{7}$
4. (4) $CrO_{3} .$
2.
Statements I : Bromination of phenol in solvent with low polarity such as $CHCl_{3}$ or $CS_{2}$ requires Lewis acid catalyst.
Statements II : The Lewis acid catalyst polarises the bromine to generate $Br^{+}$ .
In the light of the above statements, choose the correct answer from the options given below :
1. (1) $Both Statement I and Statement II are true$
2. (2) $Statement I is true but Statement II is false$
3. (3) $Statement I is false but Statement II is true$
4. (4) $Both Statement I and Statement II are false$
3.
The catalyst used in the preparation of an alkyl chloride by the action of dry $HCl$ on an alcohol is
1. (1) $anhydrous AlCl_{3}$
2. (2) $FeCl_{3}$
3. (3) $anhydrous ZnCl_{2}$
4. (4) $Cu .$
4.
1-Propanol can be distinguished from 2-propanol by which test?
1. (1) $2,4-DNP test$
2. (2) $Tollen's test$
3. (3) $Lucas test$
4. (4) $Fehling's test$
5.
Catalytic dehydrogenation of a primary alcohol gives a
1. (1) $ketone$
2. (2) $ester$
3. (3) $secondary alcohol$
4. (4) $aldehyde.$
6.
Which of the following has more $pK_{a}$ value?
1. (1) $2-Nitrophenol$
2. (2) $3-Nitrophenol$
3. (3) $4-Nitrophenol$
4. (4) $2,4-Dinitrophenol$
7.
Formic acid is a stronger acid than acetic acid. This can be explained using
1. (1) $+ M effect$
2. (2) $- I effect$
3. (3) $+ I effect$
4. (4) $- M effect.$
8.
Arrange the following phenols in decreasing order of their $pK_{a}$ (A) Phenol(B) ortho-Nitrophenol(C) meta-Nitrophenol(D) para-Nitrophenol
1. (1) $D > B > C > A$
2. (2) $A > C > B > D$
3. (3) $A > C > D > B$
4. (4) $B > D > C > A$
9.
$Match the LIST-I with LIST-II (al ph e) (Reagent) (Functional Group detected)$
$LIST-I$ $LIST-II$
$A. Sodium bicarbonate solution$ $I. Double bond /unsaturation$
$B. Neutral ferric chloride$ $II.$
$carboxylic acid C. ceric ammonium nitrate III. phenolic - OH D. alkaline KMnO_{4} IV. alcoholic - OH Choose the correct answer from the options given below:$
1. (1) $A-II, B-III, C-I, D-IV$
2. (2) $A-II, B-IV, C-III, D-I$
3. (3) $A-III, B-II, C-IV, D-I$
4. (4) $A-II, B-III, C-IV, D-I$
10.
Phenolic group can be identified by a positive:
1. (1) $Phthalein dye test$
2. (2) $Lucas test$
3. (3) $Tollen's test$
4. (4) $Carbylamine test$
11.
Given below are two statements :
Statement I : On heating with $K H S O_{4}$ , glycerol is dehydrated and acrolein is formed.
Statement II : Acrolein has fruity odour and can be used to test glycerol's presence.
Choose the correct option.
1. (1) $Both Statement I and Statement II are correct.$
2. (2) $Both Statement I and Statement II are incorrect$
3. (3) $Statement I is correct but Statement II is incorrect.$
4. (4) $Statement I is incorrect but Statement II is correct.$
12.
Reaction by which benzaldehyde cannot be prepared is
1. (1) $Toluene (i) C r O_{2} C l_{2} in C S_{2} (ii) H_{3} O^{+}$
2. (2) $Benzoyl chloride + H_{2} \to Pd - BaSO_{4} Δ$
3. (3) $Benzene + CO + HCl \to anhydrous AlCl_{3}$
4. (4) $Benzoic acid \to Zn - Hg and conc . HCl$
13.
Reduction of ketones cannot be carried out with which of the following reagents?
1. (1) $Hydrogen in presence of palladium in barium sulphate and quinoline$
2. (2) $Sodium borohydride or lithium aluminium hydride$
3. (3) $Zinc amalgam and concentrated HCl$
4. (4) $Hydrazine and KOH in ethylene glycol$
14.
Given below are two statements:
Statement (I): The boiling points of alcohols and phenols increase with increase in the number of C-atoms.
Statement (II): The boiling points of alcohols and phenols are higher in comparison to other class of compounds such as ethers, haloalkanes.
choose the correct answer from the options given below:
1. (1) $Both Statement I and Statement II are false$
2. (2) $Both Statement I and Statement II are true$
3. (3) $Statement I is false but Statement II is true$
4. (4) $Statement I is true but Statement II is false$
15.
Given below are two statements.
Statement I: Phenols are weakly acidic.
Statement II: Therefore they are freely soluble in NaOH solution and are weaker acids than alcohols and water.
Choose the most appropriate option:
1. (1) $Both Statement I and Statement II are correct.$
2. (2) $Both Statement I and Statement n are incorrect.$
3. (3) $Statement I is correct but Statement n is incorrect.$
4. (4) $Statement I is incorrect but Statement n is correct.$
16.
The compound which gives turbidity immediately with Lucas reagent at room temperature is
1. (1) $butan-1-ol$
2. (2) $butan-2-ol$
3. (3) $2-methyl propan-2-ol$
4. (4) $2-methyl propan-1-ol.$
17.
Which among the following reactions occurs by breaking of $C - O$ bond in alcohol?
1. (1) $Reaction with propionic acid$
2. (2) $Reaction with acetic anhydride$
3. (3) $Reaction with phosphorus trichloride$
4. (4) $Reaction with acetyl chloride$
18.
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Alcohols react both as nucleophiles and electrophiles.
Reason R: Alcohols react with active metals such as sodium, potassium and aluminum to yield corresponding alkoxides and liberate hydrogen.
In the light of the above statements, choose the correct answer from the options given below:
1. (1) $A is false but R is true.$
2. (2) $A is true but R is false.$
3. (3) $Both A and R are true and R is the correct explanation of A .$
4. (4) $Both A and R are true but R is NOT the correct explanation of A$
19.
Which one is the most acidic compound? [NEET 2017]
1. (1)
2. (2)
3. (3)
4. (4)
20.
Which of the following compound has no reaction with sodium metal?
1. (1) $Phenol$
2. (2) $Ethanol$
3. (3) $Benzoic acid$
4. (4) $Anisole$
21.
Ceric ammonium nitrate and $CHCl_{3} /$ alc.KOH are used for the identification of functional groups present in _______ and ______ respectively.
1. (1) $alcohol, amine$
2. (2) $amine, alcohol$
3. (3) $alcohol, phenol$
4. (4) $amine, phenol$
22.
Which one of the following phenols does not give colour when condensed with phthalic anhydride in presenceof conc. $H_{2} S O_{4}$ ?
1. (1)
2. (2)
3. (3)
4. (4)
23.
Increasing order of acid strength among $p$ ‐methoxyphenol, $p$
‐methylphenol and $p$ ‐nitrophenol is
1. (1) $p ‐nitrophenol, p ‐methoxyphenol, p ‐methylphenol$
2. (2) $p ‐methylphenol, p ‐methoxyphenol, p ‐nitrophenol$
3. (3) $p ‐nitrophenol, p ‐methylphenol, p ‐methoxyphenol$
4. (4) $p ‐methoxyphenol, p ‐methylphenol, p ‐nitrophenol.$
24.
Which of the following orders is true regarding the acidic nature of phenol?
1. (1) $Phenol > 0 -cresol > 0 -nitrophenol$
2. (2) $o -Cresol < phenol < o -nitrophenol$
3. (3) $Phenol <o-cresol > o -nitrophenol$
4. (4) $Phenol < o -cresol < o -nitrophenol$
25.
An organic compound ' $A$ ' burns with a sooty flame. It is negative towards Tollens' reagent test and positive for Borsche's reagent test. 'The compound ' $A$ ' is
1. (1) $benzaldehyde$
2. (2) $acetopherione$
3. (3) $acetone$
4. (4) $salicylic acid.$
26.
The compound which does not react with sodium is
1. (1) $C H_{3} C O O H$
2. (2) $C H_{3} C H O H C H_{3}$
3. (3) $C_{2} H_{5} O H$
4. (4) $C H_{3} O C H_{3}$
27.
A hydroxy compound $(X)$ with molar mass $122 g mol^{- 1}$ is acetylated with acetic anhydride, using a large excess of the reagent ensuring complete acetylation of all hydroxyl groups. The product obtained has a molar mass of $290 g mol^{- 1}$ . The number of hydroxyl groups present in compound (X) is:
1. (1) $5$
2. (2) $2$
3. (3) $4$
4. (4) $3$
28.
Identity $Z$ in the sequence of reactions,
$CH_{3} CH_{2} CH = CH_{2} HBr / H_{2} O_{2} Y C_{2} H_{5} ONa Z$
1. (1) $CH_{3} - (CH_{2})_{3} - O - CH_{2} CH_{3}$
2. (2) $(CH_{3})_{2} CH_{2} - O - CH_{2} CH_{3}$
3. (3) $CH_{3} (CH_{2})_{4} - O - CH_{3}$
4. (4) $CH_{3} CH_{2} - CH (CH_{3}) - O - CH_{2} CH_{3}$
29.
Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason R:
Assertion A: $pK_{a}$ value of phenol is 10.0 while that of ethanol is 15.9 .
Reason R: Ethanol is stronger acid than phenol.
In the light of the above statements, choose the correct answer from the options given below:
1. (1) $A is true but R is false.$
2. (2) $A is false but R is true.$
3. (3) $Both A and R are true and R is the correct explanation of A .$
4. (4) $Both A and R are true but R is NOT the correct explanation of A.$
30.
Which of the following cannot be used to oxidize primary alcohols to aldehydes?
1. (1) $CrO_{3} in anhydrous medium$
2. (2) $Pyridinium chlorochromate$
3. (3) $KMnO_{4} in acidic medium$
4. (4) $Heating in presence of Cu at 573 K$