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Alcohols Phenols and Ethers NEET Objective Questions for Students
Alcohol which gives a red color with the Victor Meyer test is :
(A) C₂H5OH
(B) CH3-CH(OH)-CH3
(C) C(CH3)3OH
(D) None of the above
Option a – C₂H5OH
When acetone reacts with the Grignard reagent it gives
(A) 1° -alcohol
(B) 2° -alcohol
(C) 3° -alcohol
(D) Methyl alcohol
Option c – 3° -alcohol
Consider the following reaction: C2H5OH + H2SO4 → Produce Among the following, which one cannot be formed as a product under any conditions?
(A) Ethyl-hydrogen sulfate
(B) Ethylene
(C) Acetylene
(D) Diethyl ether
Option c – Acetylene
Which of the following reactions of alcohol does not involve O – H bond breaking :
(A) Reaction with alkali metals
(B) Reaction with an acyl chloride
(C) Reaction with sulphonyl chloride
(D) Reaction with conc. sulphuric acid
Option d – Reaction with conc. sulphuric acid
An organic compound dissolved in dry benzene evolved hydrogen on treatment with sodium. It is
(A) A ketone
(B) An aldehyde
(C) A tertiary amine
(D) An alcohol
Option d – An alcohol
When ethyl alcohol reacts with acetic acid, the products formed are
(A) Sodium ethoxide + hydrogen
(B) Ethyl acetate + water
(C) Ethyl acetate + soap
(D) Ethyl alcohol + water
Option b – Ethyl acetate + water
Methyl alcohol reacts with phosphorus trichloride to form
(A) Methane
(B) Methyl chloride
(C) Acetyl chloride
(D) Dimethyl ether
Option b – Methyl chloride
The -OH group of methyl alcohol cannot be replaced by chlorine by the action of
(A) Chlorine
(B) Hydrogen chloride
(C) Phosphorus trichloride
(D) Phosphorus pentachloride
Option a – Chlorine
Hydrogen bonding is possible in
(A) Ethers
(B) Hydrocarbons
(C) Alkanes
(D) Alcohols
Option d – Alcohols
The increasing order of boiling points of 1º, 2º, 3° alcohol is
(A) 1° 2° > 3⁰
(B) 3° 2° > 1°
(C) 2° > 1°> 3°
(D) None
Option a – 1° 2° > 3⁰
The solubility of lower alcohols in water is due to
(A) the Formation of hydrogen bonds between alcohol and water molecules
(B) the Hydrophobic nature of alcohol
(C) the Increases in boiling points
(D) None of these
Option a – the Formation of hydrogen bonds between alcohol and water molecules
Conversion of CH3OH to CH3COOH can suitably be carried out with the reagent (under high-pressure conditions) :
(A) CO2/H2SO4
(B) CO/BF3
(C) CO2/BF3
(D) CO/H2SO4
Option b – CO/BF3
From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous is
(A) 1-Butanol
(B) 2-Butanol
(C) 2-Methylpropan-2-ol
(D) 2-Methylpropanol
Option c – 2-Methylpropan-2-ol
Primary amines can be converted into alkanols by reaction with
(A) Aqueous HCI
(B) Tilden’s reagent
(C) NaNO2 & dil. HCI
(D) Hypochlorous acid
Option c – NaNO2 & dil. HCl
Ethyl alcohol is made unfit for drinking by the addition of the following.
(A) Potassium Cyanide
(B) Methanol and Pyridine
(C) Acetic acid and Pyridine
(D) Naphthalene
Option b – Methanol and Pyridine
The offending substance in the liquor tragedies leading to blindness etc. is
(A) Ethyl alcohol
(B) Amyl alcohol
(C) Benzyl alcohol
(D) Methyl alcohol
Option d – Methyl alcohol
To whom is molasses are excellent raw material for production?
(A) Glycerin
(B) Urea
(C) Alcohol
(D) Paraffin
Option c – Alcohol
Which one of the following is also known as ‘wood spirit’?
(A) Methyl alcohol
(B) Ethyl alcohol
(C) Ethylene glycol
(D) Glycerol
Option a – Methyl alcohol
Fermentation of sugar leads to
(A) Ethyl alcohol
(B) Methyl alcohol
(C) Acetic acid
(D) Chlorophyll
Option a – Ethyl alcohol
Which of the following alcohols does not give a red color in the Victor Meyer test
(A) Isobutyl alcohol
(B) Isoamyl alcohol
(C) Diethyl carbinol
(D) Phenylcarbinol
Option c – Diethyl carbinol
Methanol and ethanol are distinguished by
(A) Treating with Schiff’s reagent
(B) Treating with Lucas reagent
(C) Heating with iodine and alkali
(D) Treating with CrO3 in dil. H₂SO4
Option c – Heating with iodine and alkali
The presence of -OH on adjacent carbon atoms can be detected by the reaction of the compound with
(A) Conc. H₂SO4
(B) Conc. HNO3
(C) HIO4
(D) Acidic KMnO4
Option a – Conc. H₂SO4
The reactivities of alcohol CH3OH, 1°, 2°, 3° towards metals follow the order :
(A) CH3OH > 1° > 2º > 3°
(B) 1° > 2°> 3° > CH3OH
(C) CH3OH > 3⁰° > 2° > 1°
(D) CH3OH > 2° > 3° > 1°
Option a – CH3OH > 1° > 2º > 3°
Which of the following is not expected to give ether on reaction with sodium methoxide
(A) CH3CH2CH2Cl
(B) CH2 = CHCH2Cl
(C) PhCH₂Cl
(D) CH₂ = CHCI
Option d – CH₂ = CHCl
The order of reactivity of the following alcohols with a given halogen acid, say HBr, is
(A) CH3CH₂CHOHCH3 > CH3CH₂CH₂CH₂OH > (CH3)3COH
(B) (CH3)3COH > CH3CH2CHOHCH3 > CH3CH2CH2CH2OH
(C) CH3CH2CH2CH2OH > CH3CH₂CHOHCH3> (CH3)3COH
(D) (CH3)3COH > CH3CH2CH2CH₂OH > CH3CH₂CHOHCH3
Option b – (CH3)3COH > CH3CH2CHOHCH3 > CH3CH2CH2CH2OH
Tertiary alcohols are resistant to oxidation because
(A) They do not have a hydrogen atom
(B) Of large +1 effect of alkyl groups
(C) Of greater steric hindrance
(D) All the above
Option b – Of large +1 effect of alkyl groups
Ethanol on heating with acetic acid in the presence of a few drops of sulphuric acid gives the smell of :
(A) Oil of wintergreen
(B) Oil of mustard
(C) An ester
(D) Oil of bitter almonds
Option c – An ester
A compound X with the molecular formula C3H8O can be oxidized to a compound Y with the molecular formula C3H6O2, X is most likely to be
(A) Primary alcohol
(B) Secondary alcohol
(C) Aldehyde
(D) Ketone
Option a – Primary alcohol
A compound is soluble in concentrated H₂SO4. It does not decolorize bromine in carbon tetrachloride but is oxidized by chromic anhydride in aq. sulphuric acid within two seconds, turning the orange solution to blue-green and then opaque. The original compound is
(A) A primary alcohol
(B) A tertiary alcohol
(C) An alkene
(D) An ether
Option a – A primary alcohol
The reaction of alcohol does not show cleavage of the R-O linkage
(A) ROH + PCl5
(B) ROH + SOCI2
(C) ROH + HCI
(D) ROH + Na
Option d – ROH + Na
Replacement of the -OH group in alcohol by -Cl cannot be carried out with
(A) PCl5
(B) SO2Cl2
(C) PCl3
(D) SOCI2
Option b – SO2Cl2
Which alcohol does not give a ketone on oxidation
(A) Isopropyl alcohol
(B) Allyl alcohol
(C) Ethylmethylcarbinol
(D) Methylphenylcarbinol
Option b – Allyl alcohol
To prepare 3-ethylpentan-3-ol, the reactants needed are
(A) CH3CH2MgBr + CH3COCH2CH3
(B) CH3MgBr + CH3CH2CH2COCH2CH3
(C) CH3CH2MgBr + CH3CH2COCH2CH3
(D) CH3CH2CH2MgBr + CH3COCH2CH3
Option c – CH3CH2MgBr + CH3CH2COCH2CH3
Action of HNO2 on CH3NH2 gives
(A) CH3OH
(B) CH3-O-CH3
(C) CH3-O-N = O
(D) B and C both
Option d – B and C both
Propene is allowed to react with HBr in the presence of benzoyl peroxide and the product is subsequently heated with aqueous KOH. The final product obtained is
(A) 2-propanol
(B) 1,2-propanediol
(C) 1-propanol
(D) 1,3-propanediol
Option c – 1-propanol
Which of the following sets of reactants may be used to prepare 2-Methyl-2-butanol, C2H5C(OH)(CH3)2?
(A) 2-Butanone and methylmagnesium iodide
(B) Propanone and ethyl magnesium iodide
(C) Either of the above two
(D) Propanal and isopropyl magnesium bromide
Option c – Either of the above two
Isopropylamine is allowed to react with NaNO2 and dilute H₂SO4 at a temperature ranging from 0°C to 5°C. The expected product is
(A) 2-propanol
(B) 2-propanone
(C) 1-propanol
(D) 2-nitropropane
Option a – 2-propanol
LiAlH4 converts acetic acid into
(A) Acetaldehyde
(B) Methane
(C) Ethyl alcohol
(D) Methyl alcohol
Option c – Ethyl alcohol
For which of the following parameters the I structural isomers C2H5OH and CH3OCH3 would be expected to have the same values? (Assume ideal behavior)
(A) Heat of vaporization
(B) Vapour pressure at the same temperature
(C) Boiling points
(D) Gaseous densities at the same temperature and pressure
Option d – Gaseous densities at the same temperature and pressure
When CH2=CH-COOH is reduced with LiAlH4, the compound obtained will be
(A) CH3-CH2-CH2OH
(B) CH3-CH2-CHO
(C) CH3-CH2-COOH
(D) CH2=CH-CH₂OH
Option d – CH2=CH-CH₂OH
The hydroboration of 2-methyl propene yields
(A) 1° alcohol
(B) 2° alcohol
(C) 3° alcohol
(D) None
Option a – 1° alcohol
Alkyl chloride is formed when alcohol is treated in the presence of anhydrous ZnCl2. The HCl in reactivity with respect to alcohol is: in order of
(A) 3° >2°> 1°
(B) 1° >2°> 3°
(C) 2°> 1° > 3⁰
(D) 1° > 3° > 2⁰
Option a – 3° >2°> 1°
The action of nitrous acid on ethyl amine gives
(A) C2H6
(B) C₂H5OH
(C) NH3
(D) Nitromethane
Option b – C₂H5OH
At low temperatures, phenol reacts with Br₂ in CS₂ to form …….. as a minor product.
(A) p-bromophenol
(B) o-bromophenol
(C) 2,4-dibromophenol
(D) 2,4,6-tribromophenol
Option b – o-bromophenol
………. is formed 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 of the following has at least one OH group? (I) Salicylic acid (II) Anisole (III) Adipic acid (IV) Lactic acid (V) Vanillin (VI) Glyceraldehyde
(A) (II) and (V)
(B) (I), (IV), (V), and (VI)
(C) (I) and (IV)
(D) (I), (III), (V), and (VI)
Option b – (I), (IV), (V), and (VI)
The major product of acid-catalyzed dehydration of 1-methyl cyclohexanol is ………
(A) Cyclohexene
(B) 3-Methylcyclohexene
(C) 2-Methylcyclohexene
(D) 1-Methylcyclohexene
Option d – 1-Methylcyclohexene
What is the possible number of structural isomers of aliphatic monohydroxy alcohol consisting of a total of five carbon atoms including only one methyl group as a branch?
(A) 2
(B) 3
(C) 4
(D) 5
Option c – 4
In the mechanism of hydration of an alkene acid, the I presence of sulphuric electrophile involved is …….
(A) H₂O
(B) H3O
(C) SO3
(D) OH
Option b – H3O
Phenol in presence of sodium hydroxide reacts with chloroform to form salicylaldehyde. The reaction is known as ………
(A) Kolbe’s reaction
(B) Reimer-Tiemann reaction
(C) Stephen’s reaction
(D) Williamson synthesis
Option b – Reimer-Tiemann reaction
Identify the ether among the following that yields ethanol as one of the products of reaction with cold hydroiodic acid.
(A) Methoxyethane
(B) 1-Ethoxy-2-methylpropane
(C) 2-Ethoxy-2-methylpropane
(D) Ethoxybenzene
Option c – 2-Ethoxy-2-methylpropane
The intermolecular dehydration of ethanol at 413 K is an example of ……… reaction.
(A) addition
(B) elimination
(C) rearrangement
(D) substitution
Option d – substitution
Identify the CORRECT statement regarding 1-phenyl ethanol.
(A) It is vinylic alcohol.
(B) It is a phenol.
(C) It is benzylic alcohol.
(D) It is allylic alcohol.
Option c – It is benzylic alcohol.
The most suitable reagent for the following conversion is ……… Acetic acid → Ethanol
(A) H₂/Raney nickel
(B) NaBH4
(C) LiAlH4/ether, H₂O
(D) P₂05/heat
Option c – LiAlH4/ether, H₂O
Which of the following is the least acidic? (I) p-Bromophenol (II) p-Methoxyphenol (III) p-Cresol (IV) p-Hydroxybenzoic acid
(A) (I)
(B) (II)
(C) (III)
(D) (IV)
Option b – (II)
How many sigma bonds are present in m-cresol?
(A) 8
(B) 12
(C) 15
(D) 16
Option d – 16
Sorbitol has ………
(A) four primaries and two secondary -OH groups
(B) four secondary and two primary -OH groups
(C) six primary -OH groups
(D) six secondary -OH groups
Option b – four secondary and two primary -OH groups
Which of the following is CORRECT regarding Kolbe’s reaction?
(A) The first step of the reaction involves the conversion of phenol to phenoxide ion.
(B) In the second step of the reaction, the phenoxide ion undergoes aromatic nucleophilic substitution with CO₂.
(C) At lower temperatures, 4-hydroxybenzoic acid is the major product.
(D) At higher temperatures, 2-hydroxybenzoic acid is the major product.
Option a – The first step of the reaction involves the conversion of phenol to phenoxide ion.
Propanal on hydrogenation in presence of Pt forms (X). In the presence of HBF4, (X) reacts with diazomethane to give …….
(A) methoxymethane
(B) methoxy ethane
(C) 1-methoxypropane
(D) 2-methoxypropane
Option c – 1-methoxypropane
An organic compound on treatment with conc sulphuric acid gives an intermediate compound which on further hydrolysis gives, isopropanol. The organic compound is …….. and the process is called ……….
(A) CH3CH₂CH₂OH; elimination
(B) CH3CH₂CH3; dehydration
(C) CH3CH=CH2; substitution
(D) CH₂=CHCH3; hydration
Option d – CH₂=CHCH3; hydration
Chlorobenzene is heated with steam at 698 K using Ca3(PO4)2 as a catalyst to form compound (A When compound (A) is heated with zinc dust compound (B) is obtained. Identify the CORRECT statement about compound (B).
(A) Compound (B) is a diketone.
(B) Compound (B) is a haloarene.
(C) Compound (B) is an aldehyde.
(D) Compound (B) is an aromatic hydrocarbon
Option d – Compound (B) is an aromatic hydrocarbon
Catalytic hydrogenation of butanal yield ………
(A) n-butane
(B) pentan-2-ol
(C) butan-1-ol
(D) butanoic acid
Option c – butan-1-ol
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