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MCQ for Class 12 Chemistry Chapter 11 Alcohols Phenols and Ethers
Class 12 Chemistry students should refer to the following multiple-choice questions with answers for Chapter 11 Alcohols Phenols and Ethers in Class 12.
Chapter 11 Alcohols Phenols and Ethers MCQ Questions Class 12 Chemistry with Answers
Question : Cresol has
(a) Alcoholic – OH
(b) Phenolic – OH
(c) – COOH
(d) – CHO
Answer : B
Question : How many isomers of C5H11OH will be primary alcohols ?
(a) 5
(b) 4
(c) 2
(d) 3
Answer : B
Question : How many alcohol(s) with molecular formula C4H10O are chiral in nature?
(a) 1
(b) 2
(c) 3
(d) 4
Answer : A
Question : Ethyl alcohol is industrially prepared from ethylene by
(a) Permanganate oxidation
(b) Catalytic reduction
(c) Absorbing in H2SO4 followed by hydrolysis
(d) All the three
Answer : C
Question : Sodium salt of benzene sulphonic acid on fusion with caustic soda gives
(a) Benzene
(b) Phenol
(c) Thiophenol
(d) Benzoic acid
Answer : B
Question : Acid catalyzed hydration of alkenes except ethene leads to the formation of
(a) primary alcohol
(b) secondary or tertiary alcohol
(c) mixture of primary and secondary alcohols
(d) mixture of secondary and tertiary alcohols
Answer : B
Question : Ethyl alcohol can be prepared from Grignard reagent by the reaction of :
(a) HCHO (b) R2CO
(c) RCN (d) RCOCl
Answer : A
Question : Isopropyl alcohol is obtained by reacting which of the following alkenes with concentrated H2SO4 followed by boiling with H2O?
(a) Ethylene
(b) Propylene
(c) 2-Methylpropene
(d) Isoprene
Answer : B
Question : Alkenes convert into alcohols by
(a) hydrolysis by dil. H2SO4
(b) hydration of alkene by alkaline KMnO4
(c) hydrolysis by water vapours and conc. HNO3
(d) hydration of alkene by aqueous KOH
Answer : B
Question : Which of the following reacts with NaOH to give an alcohol?
(a) Propene
(b) Butene
(c) Ethanal
(d) Methanal
Answer : D
Question : Which of the following compounds is oxidised to prepare methyl ethyl ketone?
(a) 2-Propanol
(b) l-Butanol
(c) 2-Butanol
(d) t-Butyl alcohol
Answer : C
Question : The compound HOCH2 -CH2OH is
(a) ethane glycol
(b) ethylene glycol
(c) ethylidene alcohol
(d) dimethyl alcohol
Answer : B
Question : HBr reacts fastest with
(a) 2-Mehtylpropan-1-ol
(b) 2-Methylpropene-2-ol
(c) propan-2-ol
(d) propan-1-ol
Answer : B
Question : Which of the following is dihydric alcohol ?
(a) Glycerol
(b) Ethylene glycol
(c) Catechol
(d) Resorcinol
Answer : B
Question : An example of a compound with functional group – O – is :
(a) acetic acid
(b) methyl alcohol
(c) diethyl ether
(d) acetone
Answer : C
Question : Butane-2-ol is
(a) primary alcohol
(b) secondary alcohol
(c) tertiary alcohol
(d) aldehyde
Answer : D
Question : Cresol has
(a) Alcoholic – OH
(b) Phenolic – OH
(c) – COOH
(d) – CHO
Answer : B
Question : How many isomers of C5H11OH will be primary alcohols ?
(a) 5
(b) 4
(c) 2
(d) 3
Answer : B
Question : n-Propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent?
(a) PCl5
(b) Reduction
(c) Oxidation with potassium dichromate
(d) Ozonolysis
Answer : D
Question : Number of metamers represented by molecular formula C4H10O is
(a) 4
(b) 3
(c) 2
(d) 1
Answer : B
Question : Lucas reagent is
(a) Conc. HCl and anhydrous ZnCl2
(b) Conc. HNO3 and hydrous ZnCl2
(c) Conc. HCl and hydrous ZnCl2
(d) Conc. HNO3 and anhydrous ZnCl
Answer : A
Question : How many alcohol(s) with molecular formula C4H10O are chiral in nature?
(a) 1
(b) 2
(c) 3
(d) 4
Answer : A
Question : The compound which reacts fastest with Lucas reagent at room temperature is
(a) Butan-1-ol
(b) Butan-2-ol
(c) 2-Methyl propan-1-ol
(d) 2-Methylpropan-2-ol
Answer : D
Question : IUPAC name of m-cresol is ___________
(a) 2-methylphenol
(b) 3-chlorophenol
(c) 3-methoxyphenol
(d) benzene-1, 3-diol
Answer : A
Question : When phenol is treated with excess bromine water, it gives:
(a) m-Bromophenol
(b) o- and p-Bromophenol
(c) 2, 4-Dibromophenol
(d) 2, 4, 6-Tribromophenol
Answer : D
Question : When phenol is heated with CHCl3 and alcoholic KOH when salicyladehyde is produced. This reaction is known as
(a) Rosenmund’s reaction
(b) Reimer-Tiemann reaction
(c) Friedel-Crafts reaction
(d) Sommelet reaction
Answer : B
Question : On distilling phenol with Zn dust, one gets :
(a) Toluene
(b) Benzaldehyde + ZnO
(c) ZnO + benzene
(d) Benzoic acid
Answer : C
Question : Which of the following is an example of unsymmetrical ether?
(a) C2H5OC2H5
(b) C6H5OC6H5
(c) C6H5OC2H5
(d) CH3OCH
Answer : C
Question : Which of the following will not form phenol or phenoxide ?
(a) C6H5N2Cl
(b) C6H5SO3Na
(c) C6H5Cl
(d) C6H5CO2H
Answer : D
Question : Benzyl alcohol is obtained from benzaldehyde by
(a) Fittig’s reaction
(b) Cannizzaro’s reaction
(c) Kolbe’s reaction
(d) Wurtz’s reaction
Answer : B
Question : In the reduction R - CHO+ H2 →RCH2OH the catalyst used is :
(a) Ni
(b) Pd
(c) Pt
(d) Any of these
Answer : D
Question : Ethylene reacts with Baeyer’s reagent to give
(a) ethane
(b) ethyl alcohol
(c) ethylene glycol
(d) None of these
Answer : C
Question : Ethyl alcohol is industrially prepared from ethylene by
(a) Permanganate oxidation
(b) Catalytic reduction
(c) Absorbing in H2SO4 followed by hydrolysis
(d) All the three
Answer : C
Question : Sodium salt of benzene sulphonic acid on fusion with caustic soda gives
(a) Benzene
(b) Phenol
(c) Thiophenol
(d) Benzoic acid
Answer : B
Question : Acid catalyzed hydration of alkenes except ethene leads to the formation of
(a) primary alcohol
(b) secondary or tertiary alcohol
(c) mixture of primary and secondary alcohols
(d) mixture of secondary and tertiary alcohols
Answer : C
Question : Ethyl alcohol can be prepared from Grignard reagent by the reaction of :
(a) HCHO
(b) R2CO
(c) RCN
(d) RCOCl
Answer : A
Question : Isopropyl alcohol is obtained by reacting which of the following alkenes with concentrated H2SO4 followed by boiling with H2O?
(a) Ethylene
(b) Propylene
(c) 2-Methylpropene
(d) Isoprene
Answer : D
Question : Alkenes convert into alcohols by
(a) hydrolysis by dil. H2SO4
(b) hydration of alkene by alkaline KMnO4
(c) hydrolysis by water vapours and conc. HNO3
(d) hydration of alkene by aqueous KOH
Answer : B
Question : Which of the following reacts with NaOH to give an alcohol?
(a) Propene
(b) Butene
(c) Ethanal
(d) Methanal
Answer : D
Question : By which of the following methods alcohol can be prepared in excellent yield?
(a) From alkenes
(b) By hydroboration-oxidation
(c) From carbonyl compounds
(d) From Grignard reagent
Answer : D
Question : Which of the following are used to convert RCHO into RCH2OH?
(i) H2/Pd
(ii) LiAlH4
(iii) NaBH4
(iv) Reaction with RMgX followed by hydrolysis
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii), (iii) and (iv)
(d) (i) and (iii)
Answer : D
Question : Commercially carboxylic acids are reduced to alcohols by converting them to the ______.
(a) esters
(b) aldehydes
(c) ketones
(d) amines
Answer : A
Question : Phenols do not react with one of the following :
(a) Alkali metals
(b) Sodium hydroxide
(c) Potassium hydroxide
(d) Sodium bi-carbonate
Answer : D
Question : Dehydration of 2-butanol yields
(a) 1-butene
(b) 2-butene
(c) 2-butyne
(d) Both (a) and (b)
Answer : D
Question : The correct order of boiling points for primary (1º), secondary (2º) and tertiary alcohol (3º) is
(a) 1º > 2º > 3º
(b) 3º > 2º > 1º
(c) 2º > 1º > 3º
(d) 2º > 3º > 1º
Answer : A
Question : Alcohols of low molecular weight are
(a) soluble in water
(b) soluble in water on heating
(c) insoluble in water
(d) insoluble in all solvents
Answer : A
Question : Which of the following has lowest boiling point ?
(a) p-Nitrophenol
(b) m-Nitrophenol
(c) o-Nitrophenol
(d) Phenol
Answer : C
Question : Which statement is not correct about alcohol?
(a) Molecular weight of alcohol is higher than water
(b) Alcohol of less no. of carbon atoms is less soluble in water than alcohol of more no. of carbon atoms
(c) Alcohol evaporates quickly
(d) All of the above
Answer : B
Question : Which one of the following alcohols is least soluble in water?
(a) CH3OH
(b) C3H7OH
(c) C4H9OH
(d) C10H21OH
Answer : D
Question : Methanol and ethanol are miscible in water due to
(a) covalent character
(b) hydrogen bonding character
(c) oxygen bonding character
(d) None of these
Answer : B
Question : If ethanol dissolves in water, then which of the following would be observed
(a) absorption of heat and contraction in volume
(b) emission of heat and contraction in volume
(c) absorption of heat and increase in volume
(d) emission of heat and increase in volume
Answer : B
Question : Which of the following is correct ?
(a) On reduction of any aldehyde, secondary alcohol is formed
(b) Reaction of vegetable oil with H2SO4 gives glycerine
(c) Sucrose on reaction with NaCl gives invert sugar
(d) Alcoholic iodine gives iodoform with NaOH
Answer : D
Question : Which of the following is not true in case of reaction with heated copper at 300°C?
(a) Phenol → Benzyl alcohol
(b) Secondary alcohol → Ketone
(c) Primary alcohol → Aldehyde
(d) Tertiary alcohol → Olefin
Answer : A
Question : Phenol is more acidic than alcohol because
(a) phenol is more stable than water
(b) phenol is aromatic and alcohol is aliphatic
(c) phenoxide ion is resonance stabilised
(d) None of these
Answer : C
Question : Acidity of phenol is due to
(a) hydrogen bonding
(b) phenolic group
(c) benzene ring
(d) resonance stabilisation of its anion
Answer : D
Question : Lucas test is done to differentiate between
(a) alcohol and ketone
(b) alcohol and aromatic ketones
(c) 1°, 2° and 3° alcohols
Answer : C
Question : The ionization constant of phenol is higher than that of ethanol because :
(a) phenoxide ion is bulkier than ethoxide
(b) phenoxide ion is stronger base than ethoxide
(c) phenoxide ion is stabilized through delocalization
(d) phenoxide ion is less stable than ethoxide
Answer : C
Question : Which one of the following on oxidation gives a ketone ?
(a) Primary alcohol
(b) Secondary alcohol
(c) Tertiary alcohol
(d) All of these
Answer : B
Question : Primary and secondary alcohols on action of reduced copper give
(a) Aldehydes and ketones respectively
(b) Ketones and aldehydes respectively
(c) Only aldehydes
(d) Only ketones
Answer : A
Question : 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
(d) None of these
Answer : B
Question : The product obtained from the reaction is
(a) Benzene (b) Toluene
(c) Salicylic acid (d) Benzoic acid
Answer : C
Question : Picric acid is
(a) Trinitrophenol (b) Trinitrotoluene
(c) Trinitrobenzene (d) Tribromobenzene
Answer : A
Question : Lucas reagent is
(a) anhy. AlCl3 + conc. HCl
(b) anhy. AlCl3 + conc.HNO3
(c) anhy. ZnCl2
(d) anhy. ZnCl2 + conc. HCl
Answer : D
Question : Lucas test is used for the detection of
(a) alcohols (b) alkyl halides
(c) phenols (d) aldehydes
Answer : A
Question : Intermolecular hydrogen bonding is strongest in
(a) Methylamine (b) Phenol
(c) Formaldehyde (d) Methanol
Answer : A
Question : Among the following the one which reacts most readily with ethanol is
(a) p-nitrobenzyl bromide
(b) p-chlorobenzyl bromide
(c) p-methoxybenzyl bromide
(d) p-methylbenzyl bromide
Answer : C
Question : The compound HOCH2 - CH2OH is
(a) ethane glycol (b) ethylene glycol
(c) ethylidene alcohol (d) dimethyl alcohol
Answer : B
Question : Which of the following is dihydric alcohol ?
(a) Glycerol (b) Ethylene glycol
(c) Catechol (d) Resorcinol
Answer : B
Question : An example of a compound with functional group – O – is :
(a) acetic acid (b) methyl alcohol
(c) diethyl ether (d) acetone
Answer : C
Question : Butane-2-ol is
(a) primary alcohol (b) secondary alcohol
(c) tertiary alcohol (d) aldehyde
Answer : B
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MCQs for Chemistry CBSE Class 12 Chapter 11 Alcohols Phenols and Ethers
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