MCQs For NCERT Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers

Please refer to the MCQ Questions for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers with Answers. The following Alcohols, Phenols and Ethers Class 12 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 12. Our experts have designed MCQ Questions for Class 12 Chemistry with Answers for all chapters in your NCERT Class 12 Chemistry book.

Alcohols, Phenols and Ethers Class 12 MCQ Questions with Answers

See below Alcohols, Phenols and Ethers Class 12 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. The general molecular formula, which represents the homologous series of alkanols is     
(a) CnH₂n+2O
(b) CnH₂nO₂
(c) CnH₂nO
(d) CnH₂n + 1O

Question. Which of the following is most reactive towards aqueous HBr ?       
(a) 1-Phenyl – 2- propanol
(b) 1- Phenyl – 1- propanol
(c) 3-Phenyl – 1 – propanol
(d) 2- Phenyl – 1 – propanol

Question. Reaction between acetone and methyl magnesium chloride followed by hydrolysis will give       
(a) iso-propyl alcohol
(b) sec-butyl alcohol
(c) tert-butyl alcohol
(d) iso-butyl alcohol.

Question. Which of the following alcohols gives the best yield of dialkyl ether on being heated with a trace of sulphuric acid?            
(a) 2-Pentanol
(b) Cyclopentanol
(c) 2-Methyl-2-butanol
(d) 1-Pentanol

Question. When vapours of a secondary alcohol is passed over heated copper at 573 K, the product formed is       
(a) a carboxylic acid
(b) an aldehyde
(c) a ketone
(d) an alkene.

Question. Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group?       
(a) –COOH
(b) –CHCl2
(c) –CHO
(d) –CH2Cl

Question. Which of the following reaction(s) can be used for the preparation of alkyl halides?       
(I) CH3CH₂OH + HCl    →^Anh.ZnCl₂
(II) CH3CH2OH + HCl   →
(III) (CH3)3COH + HCl   →
(IV) (CH3)2CHOH + HCl   →^Anh.ZnCl₂
(a) (I) and (II) only
(b) (IV) only
(c) (III) and (IV) only
(d) (I), (III) and (IV) only 

Question. Which of the following will not be soluble in sodium hydrogen carbonate?       
(a) 2,4,6-Trinitrophenol
(b) Benzoic acid
(c) o-Nitrophenol
(d) Benzenesulphonic acid 

Question. Given are cyclohexanol (I), acetic acid (II),2,4,6-trinitrophenol (III) and phenol (IV). In these the order of decreasing acidic character will be       
(a) III > II > IV > I
(b) II > III > I > IV
(c) II > III > IV > I
(d) III > IV > II > I

Question. Among the following four compounds       
(i) Phenol
(ii) Methyl phenol
(iii) Meta-nitrophenol
(iv) Para-nitrophenol The acidity order is
(a) (iv) > (iii) > (i) > (ii)
(b) (iii) > (iv) > (i) > (ii)
(c) (i) > (iv) > (iii) > (ii)
(d) (ii) > (i) > (iii) > (iv)

Question. When glycerol is treated with excess of HI, it produces       
(a) 2-iodopropane
(b) allyl iodide
(c) propene
(d) glycerol triiodide

Question. Ethylene oxide when treated with Grignard reagent yields       
(a) primary alcohol
(b) secondary alcohol
(c) tertiary alcohol
(d) cyclopropyl alcohol.

Question. Which one of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?       
(a) CH₃CH(OH)CH₃
(b) CH₃CH₂CH(OH)CH₃
(c) CH₃OH
(d) CH₃CH₂OH

Question. Arrange the following alcohols in order of increasing ease of dehydration       
CH₃CH₂OH         C₆H₅CH₂OH
       I                         II
Cl₃CCH₂OH         F₃CCH₂OH
      III                       IV
(a) II < I < IV < III
(b) IV < III < II < I
(c) IV < III < I < II
(d) II < I < III < IV

Question. Compound ‘A’ of molecular formula C4H10O on treatment with Lucas reagent at room temperature gives compound ‘B’. When compound ‘B’ is heated with alcoholic KOH, it gives isobutene.           
Compound ‘A’ and ‘B’ are respectively 
(a) 2-methyl-2-propanol and 2-methyl-2- chloropropane
(b) 2-methyl-1 -propanol and 1-chloro-2- methylpropane
(c) 2-methyl-1 -propanol and 2-methyl-2- chloropropane
(d) butan-2-ol and 2-chlorobutane

Question. Which of the following reagents convert propene to 1-propanol?            
(a) H2 O , H2SO4
(b) Aqueous KOH
(c) MgSO4, NaBH4/H2O
(d) B2H6, H2O2, OH–

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

Question. When phenol is treated with CHCl3 and NaOH, the product formed is       
(a) benzaldehyde
(b) salicylaldehyde
(c) salicylic acid
(d) benzoic acid. 

Question. On reacting with neutral ferric chloride, phenol gives
(a) red colour
(b) blue colour 
(c) violet colour
(d) green co low   

Question. Carbolic acid is
(a) HCOOH
(b) CH₃COOH
(c) C₆H₅COOH
(d) C₆H₅OH     

Question. When benzene sulphonic acid and p -nitrophenol are treated with NaHCO₃, the gases released respectively are
(a) SO₂ , NO₂
(b) SO₂, NO 
(c) SO₂, CO₂
(d) CO₂     

Question. The structure of the compound that gives a tribromo derivative on treatment with bromine water is 

Question. Phenol on reaction with CHCI₃ and NaOH give benzaldehyde. lntermediate of this reaction is 
(a) carbocation
(b) carbanion
(c) radical
(d) carbene   

Question. What amount of bromine will be required to convert 2 g of phenol into 2, 4, 6-tribromo phenol? 
(a) 4.00
(b) 6.00
(c) 10.22
(d) 20.44       

Question. Phenol can be distinguished from ethanol by the following reagents except 
(a) sodium
(b) NaOH/I₂
(c) neutral FeCI₃
(d) Br₂ /H₂O
(e) phthalic anhydride/cone. H₂SO₄ and NaOH       

Question. Picric acid is
(a) 2, 4, 6-tribromophenol
(b) sym-trinitrophenol
(c) trinitrophenol
(d) 2, 4, 6-trinitrotoluene     

Question. Curnene process is the most important commercial method for the manufacture of phenol. Curnene is 
(a) I-methyl ethyl benzene
(b) ethyl benzene
(c) vinyl benzene
(d) propyl benzene   

Question. Phenol gives characteristic colouration with 
(a) iodine solution
(b) bromine water
(c) aqueous FeCl₃ solution
(d) arnmonium hydroxide   

Question. When phenyl magnesium bromide reacts with t-butanol, the product would be 
(a) benzene
(b) phenol
(c) t-butyl benzene
(d) t-butyl phenyl ether     

Question. Strength of acidity is in order 

(a) II > I > III > IV
(b) Ill > IV > I > II
(c) I > IV > III > II
(d) IV > III > I > II       

Question. Which of the following is correct?       
(a) On reduction, any aldehyde gives secondary alcohol.
(b) Reaction of vegetable oil with H2SO4 gives glycerine.
(c) Alcoholic iodine with NaOH gives iodoform.
(d) Sucrose on reaction with NaCl gives invert sugar.

Question. Picric acid is:             
(a) Trinitrophenol
(b) Trinitrotoluene
(c) Trinitrobenzene
(d) Tribromobenzene

Question. Lucas test is used for the detection of 
(a) alcohols
(b) alkyl halides
(c) phenols
(d) aldehydes

Question. When 3,3-dimethyl-2-butanol is heated with H2SO4, the major product obtained is       
(a) 2,3-dimethyl-2-butene
(b) cis and trans isomers of 2,3-dimethyl-2-butene
(c) 2,3-dimethyl-1-butene
(d) 3,3-dimethyl-1-butene.

Question. On heating glycerol with conc. H₂SO₄, a compound is obtained which has bad odour. The compound is   
(a) acrolein
(b) formic acid
(c) allyl alcohol
(d) glycerol sulphate.

Question. Ethanol and dimethyl ether form a pair of functional isomers. The boiling point of ethanol is higher than that of dimethyl ether, due to the presence of       
(a) H-bonding in ethanol
(b) H-bonding in dimethyl ether
(c) CH3 group in ethanol
(d) CH3 group in dimethyl ether. 

Question. Increasing order of acid strength among p-methoxyphenol, p-methylphenol and p-nitrophenol is     
(a) p-nitrophenol, p-methoxyphenol, p-methylphenol 
(b) p-methylphenol, p-methoxyphenol, p-nitrophenol
(c) p-nitrophenol, p-methylphenol, p-methoxyphenol
(d) p-methoxyphenol, p-methylphenol, p-nitrophenol. 

Question. Which one of the following on oxidation gives a ketone?       
(a) Primary alcohol
(b) Secondary alcohol
(c) Tertiary alcohol
(d) All of these 

Question. What is formed when a primary alcohol undergoes catalytic dehydrogenation?       
(a) Aldehyde
(b) Ketone
(c) Alkene
(d) Acid 

Question. How many isomers of C5H11OH will be primary alcohols?       
(a) 5
(b) 4
(c) 2
(d) 3

Question. HBr reacts fastest with       
(a) 2-methylpropan-1-ol
(b) methylpropan-2-ol
(c) propan-2-ol
(d) propan-1-ol. 

Question. When phenol is treated with excess bromine water.It gives       
(a) m-bromophenol
(b) o- and p-bromophenols
(c) 2,4-dibromophenol
(d) 2,4,6-tribromophenol. 

Question. The compound which reacts fastest with Lucas reagent at room temperature is       
(a) butan-1-ol
(b) butan-2-ol
(c) 2-methylpropan-1-ol
(d) 2-methylpropan-2-ol. 

Question. Which one of the following compounds will be most readily attacked by an electrophile?       
(a) Chlorobenzene
(b) Benzene
(c) Phenol
(d) Toluene 

Question. Propene, CH₃CH CH₂ can be converted into 1-propanol by oxidation. Indicate which set of reagents amongst the following is ideal for the above conversion?       
(a) KMnO₄ (alkaline)
(b) Osmium tetroxide (OsO₄/CH2Cl₂)
(c) B₂H₆ and alk. H₂O₂
(d) O₃/Zn 

Question. Phenol is heated with CHCl₃ and aqueous KOH when salicylaldehyde is produced. This reaction is known as     
(a) Rosenmund’s reaction
(b) Reimer-Tiemann reaction
(c) Friedel-Crafts reaction
(d) Sommelet reaction. 

Question. Number of isomeric alcohols of molecular formula C₆H₁₄O which give positive iodoform test is       
(a) three
(b) four
(c) five
(d) two