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Alcohols Phenols and Ethers NEET Objective Questions for Students
Which alcohol produces a red color in the Victor Meyer test?
(a) Ethanol (C₂H₅OH)
(b) Isopropanol (CH₃–CH(OH)–CH₃)
(c) Tert-butanol (C(CH₃)₃OH)
(d) None of the above
Option a – Ethanol (C₂H₅OH)
Acetone reacts with a Grignard reagent to form which type of alcohol?
(a) Primary alcohol
(b) Secondary alcohol
(c) Tertiary alcohol
(d) Methanol
Option c – Tertiary alcohol
Which compound is not a possible product in the reaction of ethanol with sulfuric acid?
(a) Ethyl hydrogen sulfate
(b) Ethene
(c) Ethyne
(d) Diethyl ether
Option c – Ethyne
Which alcohol reaction does not involve the cleavage of the O–H bond?
(a) With alkali metals
(b) With acyl chlorides
(c) With sulfonyl chlorides
(d) With concentrated sulfuric acid
Option d – With concentrated sulfuric acid
A compound that releases hydrogen when dissolved in dry benzene and treated with sodium is most likely a:
(a) Ketone
(b) Aldehyde
(c) Tertiary amine
(d) Alcohol
Option d – Alcohol
The reaction between ethyl alcohol and acetic acid produces:
(a) Sodium ethoxide and hydrogen
(b) Ethyl acetate and water
(c) Ethyl acetate and soap
(d) Ethyl alcohol and water
Option b – Ethyl acetate and water
Methyl alcohol reacts with phosphorus trichloride to form:
(a) Methane
(b) Methyl chloride
(c) Acetyl chloride
(d) Dimethyl ether
Option b – Methyl chloride
Which reagent cannot substitute the –OH group in methyl alcohol with chlorine?
(a) Chlorine
(b) Hydrogen chloride
(c) Phosphorus trichloride
(d) Phosphorus pentachloride
Option a – Chlorine
Which compound type exhibits hydrogen bonding?
(a) Ethers
(b) Hydrocarbons
(c) Alkanes
(d) Alcohols
Option d – Alcohols
What is the correct order of boiling points among primary, secondary, and tertiary alcohols?
(a) 1° > 2° > 3°
(b) 3° > 2° > 1°
(c) 2° > 1° > 3°
(d) None of the above
Option a – 1° > 2° > 3°
What accounts for the solubility of lower alcohols in water?
(a) Hydrogen bonding with water molecules
(b) Hydrophobic properties
(c) High boiling points
(d) None of these
Option a – Hydrogen bonding with water molecules
Which reagent can convert methanol into acetic acid under high-pressure conditions?
(a) CO₂ / H₂SO₄
(b) CO / BF₃
(c) CO₂ / BF₃
(d) CO / H₂SO₄
Option b – CO / BF₃
Which alcohol reacts most quickly with concentrated HCl and anhydrous ZnCl₂?
(a) 1-Butanol
(b) 2-Butanol
(c) 2-Methylpropan-2-ol
(d) 2-Methylpropanol
Option c – 2-Methylpropan-2-ol
Which combination of reagents converts primary amines into alcohols?
(a) Aqueous HCl
(b) Tilden’s reagent
(c) Sodium nitrite and dilute HCl
(d) Hypochlorous acid
Option c – Sodium nitrite and dilute HCl
What is typically added to ethanol to make it undrinkable?
(a) Potassium cyanide
(b) Methanol and pyridine
(c) Acetic acid and pyridine
(d) Naphthalene
Option b – Methanol and pyridine
Which alcohol is responsible for the harmful effects seen in spurious liquor cases?
(a) Ethanol
(b) Amyl alcohol
(c) Benzyl alcohol
(d) Methanol
Option d – Methanol
Molasses is an excellent raw material for the manufacture of:
(a) Glycerin
(b) Urea
(c) Alcohol
(d) Paraffin
Option c – Alcohol
Which compound is commonly called ‘wood spirit’?
(a) Methanol
(b) Ethanol
(c) Ethylene glycol
(d) Glycerol
Option a – Methanol
The fermentation of sugar primarily produces:
(a) Ethanol
(b) Methanol
(c) Acetic acid
(d) Chlorophyll
Option a – Ethanol
Which alcohol does not produce a red color in the Victor Meyer test?
(a) Isobutyl alcohol
(b) Isoamyl alcohol
(c) Diethyl carbinol
(d) Benzyl alcohol
Option c – Diethyl carbinol
Methanol and ethanol can be distinguished using which test?
(a) Schiff’s reagent
(b) Lucas reagent
(c) Iodine with alkali
(d) Chromic acid (CrO₃ in H₂SO₄)
Option c – Iodine with alkali
A compound with –OH groups on adjacent carbon atoms can be identified using:
(a) Concentrated H₂SO₄
(b) Concentrated HNO₃
(d) Acidified KMnO₄
Option a – Concentrated H₂SO₄
Which of the following shows the correct order of reactivity with sodium metal?
(a) CH₃OH > 1° > 2° > 3°
(b) 1° > 2° > 3° > CH₃OH
(c) CH₃OH > 3° > 2° > 1°
(d) CH₃OH > 2° > 3° > 1°
Option a – CH₃OH > 1° > 2° > 3°
Which compound is least likely to form an ether when treated with sodium methoxide?
(a) CH₃CH₂CH₂Cl
(b) CH₂=CHCH₂Cl
(c) PhCH₂Cl
(d) CH₂=CHCl
Option d – CH₂=CHCl
What is the correct order of alcohol reactivity toward HBr?
(a) 2-Butanol > 1-Butanol > Tert-butanol
(b) Tert-butanol > 2-Butanol > 1-Butanol
(c) 1-Butanol > 2-Butanol > Tert-butanol
(d) Tert-butanol > 1-Butanol > 2-Butanol
Option b – Tert-butanol > 2-Butanol > 1-Butanol
Tertiary alcohols resist oxidation due to:
(a) Lack of hydrogen on the carbon
(b) Strong +I effect of alkyl groups
(c) Steric hindrance
(d) All of the above
Option b – Strong +I effect of alkyl groups
Heating ethanol with acetic acid and a few drops of H₂SO₄ gives:
(a) Oil of wintergreen
(b) Oil of mustard
(c) An ester
(d) Oil of bitter almonds
Option c – An ester
A compound X (C₃H₈O) oxidizes to form Y (C₃H₆O₂). What is X likely to be?
(a) Primary alcohol
(b) Secondary alcohol
(c) Aldehyde
(d) Ketone
Option a – Primary alcohol
A compound dissolves in concentrated H₂SO₄, doesn’t decolorize bromine in CCl₄, but quickly turns orange chromic acid to blue-green. What is it?
(A) A primary alcohol
(B) A tertiary alcohol
(C) An alkene
(D) An ether
Option a – Primary alcohol
In which reaction does the R-O bond of an alcohol remain intact?
(A) ROH + PCl₅
(B) ROH + SOCl₂
(C) ROH + HCl
(D) ROH + Na
Option d – ROH + Na
Which reagent cannot replace the -OH group in an alcohol with a -Cl group?
(A) PCl₅
(B) SO₂Cl₂
(C) PCl₃
(D) SOCl₂
Option b – SO₂Cl₂
Which alcohol doesn’t yield a ketone upon oxidation?
(A) Isopropyl alcohol
(B) Allyl alcohol
(C) Ethylmethylcarbinol
(D) Methylphenylcarbinol
Option b – Allyl alcohol
Which reactants form 3-ethylpentan-3-ol?
(A) CH₃CH₂MgBr + CH₃COCH₂CH₃
(B) CH₃MgBr + CH₃CH₂CH₂COCH₂CH₃
(C) CH₃CH₂MgBr + CH₃CH₂COCH₂CH₃
(D) CH₃CH₂CH₂MgBr + CH₃COCH₂CH₃
Option c – CH₃CH₂MgBr + CH₃CH₂COCH₂CH₃
What are the products of CH₃NH₂ reacting with HNO₂?
(A) CH₃OH
(B) CH₃-O-CH₃
(C) CH₃-O-N=O
(D) Both B and C
Option d – Both B and C
Propene + HBr (with benzoyl peroxide), followed by aqueous KOH, gives:
(A) 2-propanol
(B) 1,2-propanediol
(C) 1-propanol
(D) 1,3-propanediol
Option c – 1-propanol
Which reactants form 2-Methyl-2-butanol?
(A) 2-Butanone and methylmagnesium iodide
(B) Propanone and ethyl magnesium iodide
(C) Either of the above
(D) Propanal and isopropyl magnesium bromide
Option c – Either of the above
What forms when isopropylamine reacts with NaNO₂ and dilute H₂SO₄ (0°C to 5°C)?
(A) 2-propanol
(B) 2-propanone
(C) 1-propanol
(D) 2-nitropropane
Option a – 2-propanol
LiAlH₄ reduces acetic acid to:
(A) Acetaldehyde
(B) Methane
(C) Ethyl alcohol
(D) Methyl alcohol
Option c – Ethyl alcohol
Which property is identical for C₂H₅OH and CH₃OCH₃ under ideal conditions?
(A) Heat of vaporization
(B) Vapor pressure
(C) Boiling point
(D) Gaseous density
Option d – Gaseous density
Reduction of CH₂=CHCOOH with LiAlH₄ yields:
(A) CH₃CH₂CH₂OH
(B) CH₃CH₂CHO
(C) CH₃CH₂COOH
(D) CH₂=CHCH₂OH
Option d – CH₂=CHCH₂OH
What is the product of hydroboration of 2-methylpropene?
(A) Primary alcohol
(B) Secondary alcohol
(C) Tertiary alcohol
(D) None
Option a – Primary alcohol
Reactivity of alcohols with HCl in the presence of anhydrous ZnCl₂ is:
(A) 3° > 2° > 1°
(B) 1° > 2° > 3°
(C) 2° > 1° > 3°
(D) 1° > 3° > 2°
Option a – 3° > 2° > 1°
Ethylamine reacts with nitrous acid to give:
(A) C₂H₆
(B) C₂H₅OH
(C) NH₃
(D) CH₃NO₂
Option b – C₂H₅OH
What is the minor product when phenol reacts with Br₂ in CS₂ at low temp?
(A) p-bromophenol
(B) o-bromophenol
(C) 2,4-dibromophenol
(D) 2,4,6-tribromophenol
Option b – o-bromophenol
What forms when acetone is treated with sodium amalgam and water?
(A) Ethanol
(B) Propan-2-ol
(C) Butan-2-ol
(D) Propan-1-ol
Option b – Propan-2-ol
Which compounds have at least one OH group?
(A) II and V
(B) I, IV, V, VI
(C) I and IV
(D) I, III, V, VI
Option b – I, IV, V, VI
Acid-catalyzed dehydration of 1-methylcyclohexanol mainly yields:
(A) Cyclohexene
(B) 3-Methylcyclohexene
(C) 2-Methylcyclohexene
(D) 1-Methylcyclohexene
Option a – Cyclohexene
How many structural isomers of 5-carbon monohydroxy alcohols with one methyl branch exist?
(A) 2
(B) 3
(C) 4
(D) 5
Option c – 4
What is the electrophile in acid-catalyzed alkene hydration?
(A) H₂O
(B) H₃O⁺
(C) SO₃
(D) OH⁺
Option b – H₃O⁺
Which reaction produces salicylaldehyde from phenol, NaOH, and chloroform?
(A) Kolbe’s reaction
(B) Reimer-Tiemann reaction
(C) Stephen’s reaction
(D) Williamson synthesis
Option b – Reimer-Tiemann reaction
Which ether gives ethanol with cold HI?
(A) Methoxyethane
(B) 1-Ethoxy-2-methylpropane
(C) 2-Ethoxy-2-methylpropane
(D) Ethoxybenzene
Option c – 2-Ethoxy-2-methylpropane
Ethanol’s intermolecular dehydration at 413 K is a:
(A) Addition reaction
(B) Elimination reaction
(C) Rearrangement reaction
(D) Substitution reaction
Option d – Substitution reaction
Which is correct about 1-phenyl ethanol?
(A) Vinylic alcohol
(B) Phenol
(C) Benzylic alcohol
(D) Allylic alcohol
Option c – Benzylic alcohol
Best reagent for converting acetic acid to ethanol:
(A) H₂/Raney Ni
(B) NaBH₄
(C) LiAlH₄/ether, H₂O
(D) P₂O₅/heat
Option c – LiAlH₄/ether, H₂O
Which is least acidic?
(A) p-Bromophenol
(B) p-Methoxyphenol
(C) p-Cresol
(D) p-Hydroxybenzoic acid
Option b – p-Methoxyphenol
Number of sigma bonds in m-cresol?
(A) 8
(B) 12
(C) 15
(D) 16
Option d – 16
Which is true about sorbitol?
(A) Four primary, two secondary -OH
(B) Four secondary, two primary -OH
(C) Six primary -OH
(D) Six secondary -OH
Option b – Four secondary, two primary -OH
Which is correct about Kolbe’s reaction?
(A) Phenol turns into phenoxide in the first step
(B) Phenoxide undergoes electrophilic substitution with CO₂
(C) 4-Hydroxybenzoic acid is major at low temp
(D) 2-Hydroxybenzoic acid is major at high temp
Option a – Phenol turns into phenoxide in the first step
What forms when propanal is hydrogenated and treated with HBF₄ and diazomethane?
(A) Methoxymethane
(B) Methoxyethane
(C) 1-Methoxypropane
(D) 2-Methoxypropane
Option a – Methoxymethane
CH₃CH=CH₂ + H₂SO₄ followed by hydrolysis gives isopropanol. The initial compound is:
(A) CH₃CH₂CH₂OH; elimination
(B) CH₃CH₂CH₃; dehydration
(C) CH₃CH=CH₂; substitution
(D) CH₂=CHCH₃; hydration
Option d – CH₂=CHCH₃; hydration
What is formed when chlorobenzene reacts with steam at 698 K using Ca₃(PO₄)₂?
(A) Diketone
(B) Haloarene
(C) Aldehyde
(D) Aromatic hydrocarbon
Option d – Aromatic hydrocarbon
Hydrogenation of butanal gives:
(A) n-Butane
(B) Pentan-2-ol
(C) Butan-1-ol
(D) Butanoic acid
Option c – Butan-1-ol
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