MCQ Question for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers

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Alcohols Phenols and Ethers Class 12 MCQ Questions with Answers

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Alcohols Phenols and Ethers Class 12 MCQ Questions

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 ZnCl₂.

Question. Methanol is industrially prepared by       
(a) oxidation of CH₄ by steam at 900ºC
(b) reduction of HCHO using LiAIH₄
(c) reaction of HCHO with a solution of NaOH
(d) reduction of CO using H₂ and ZnO–Cr₂O₃

Question. The major products C and D formed in the following reactions respectively are       
H₃C−CH₂−CH₂−O−C(CH₃)₃ excess HI C + D
(a) H₃C−CH₂−CH₂−I and I−C(CH₃)₃
(b) H₃C−CH₂−CH₂−OH and I−C(CH₃)₃
(c) H₃C−CH₂−CH₂−I and HO−C(CH₃)₃
(d) H₃C−CH₂−CH₂−OH and HO−C(CH₃)₃

Question. The heating of phenyl methyl ether with HI produces       
(a) iodobenzene
(b) phenol
(c) benzene
(d) ethyl chloride.

Question. Among the following sets of reactants which one produces anisole?       
(a) CH₃CHO ; RMgX
(b) C₆H₅OH ; NaOH ; CH₃I
(c) C₆H₅OH ; neutral FeCl₃
(d) C₆H₅CH₃ ; CH₃COCl ; AlCl₃

Question. The major organic product in the reaction is       
CH₃ – O – CH(CH₃)₂ + HI products
(a) CH₃I + (CH₃)₂CHOH
(b) CH₃OH + (CH₃)₂CHI
(c) ICH₂OCH(CH₃)₂
(d) CH₂OC(CH₃)₂

Question. Ethyl chloride is converted into diethyl ether by       
(a) Perkins reaction
(b) Grignard reaction
(c) Wurtz synthesis
(d) Williamson’s synthesis.

Question. Which one of the following compounds is resistant to nucleophilic attack by hydroxyl ions?       
(a) Diethyl ether
(b) Acetonitrile
(c) Acetamide
(d) Methyl acetate

Question. The compound which does not react with sodium is       
(a) CH₃COOH
(b) CH₃CHOHCH₃
(c) C₂H₅OH
(d) CH₃OCH₃

Question. Which one is formed when sodium phenoxide is heated with ethyl iodide?       
(a) Phenetole
(b) Ethyl phenyl alcohol
(c) Phenol
(d) None of these

Question. Intermolecular hydrogen bonding is strongest in :            
(a) Methylamine
(b) Phenol
(c) Formaldehyde
(d) Methanol

Question. Propan-1-ol can be prepared from propene by :
(a) H₂O / H₂SO₄
(b) Hg(OAc)₂ / H₂O followed by NaBH₄
(c) B₂H₆ followed by H₂O₂
(d) CH₃CO₂H/H₂SO₄

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

Question. The most suitable reagent for the conversion of RCH₂OH → RCHO is :           
(a) KMnO₄
(b) K₂Cr₂O₇
(c) CrO₃
(d) PCC (pyridine chlorochromate)

Question. Lucas reagent is:             
(a) anhy. AlCl₃ + conc. HCl
(b) anhy. AlCl₃ + conc.HNO₃
(c) anhy. ZnCl₂
(d) anhy. ZnCl₂ + conc. HCl

Question. When o- or p -phenol sulphonic acid is treated with bromine water, the product formed is 
(a) 2, 4-dibromophenol
(b) 2, 4, 6-tribromophenol
(c) 3-bromophenol boric acid
(d) 3, 5-dibromophenol     

Question. The final product of the following reaction is/are

Question. Phenol on heating with CCI₄ and aqueous KOH gives salicylic acid. This reaction is 
(a) Friedel-Craft reaction
(b) Diels-Alder reaction
(c) Reimer-Tiemann reaction
(d) Wittig reaction     

Question. Among the following, which is least acidic? 
(a) phenol
(b) o-cresol
(c) p -nitrophenol
(d) p -chlorophenol     

Question. An organic compound ‘X’ with molecular fommla, C₇H₈O is insoluble in aqueous NaHCO₃ but dissolves in NaOH. When treated with bromine water’ X’rapidly gives ‘Y’ C₇H₅OBr₃ . 
The compounds’ X’ and’ Y’ respectively, are
(a) benzyl alcohol and 2, 4, 6-tribromo-3-methoxy benzene
(b) benzyl alcohol and 2, 4, 6-tribromo-3-methyl phenol
(c) o-cresol and 3, 4, 5-tribromo-2-methyl phenol
(d) methoxybenzene and 2, 4, 6-tribromo-3-methoxy benzene
(e) m-cresol and 2, 4, 6-tribromo-3-methyl phenol       

Question. Benzoylation of phenol in alkaline medium is known as
(a) Friedel-Crafts reaction
(b) Wurtz-Fittig reaction
(c) Schotten-Baurnann reaction
(d) Sabatier Senderens reduction       

Question. By heating phenol with chloroform in alkali, it is converted into 
(a) salicylic acid
(b) salicylaidehyde
(c) anisole
(d) phenyl benzoate       

Question. C₂H₅O Hand C₆H₅OHcan be distinguished by 
(a) Br₂ + H₂O
(b) FeCI₃
(c) I₂ + NaOH
(d) Both (b) and (c)         

Question. Phenol is more acidic than alcohol because
(a) phenol is more soluble in polar solvents
(b) alcohol does not lose hydrogen atom
(c) phenoxide ion is stabilised by resonance
(d) phenoxide ion doesn’t exhibit resonance         

Question. Picric acid is a stronger acid than acetic acid and benzoic acid. It contains 
(a) —SO₃H group
(b) two—COOH groups
(c) phenolic group
(d) three—COOH groups       

Question. The following reaction is known as 

(a) Perkin reaction
(b) Gattermann reaction
(c) Kolbe reaction
(d) Gattermann-a.ldehyde reaction         

Question. Which of the following compound would not evolve CO₂ when treated with NaHCO₃ solution?
(a) Salicylic acid 
(b) Phenol
(c) Benzoic acid
(d) 4-nitrobenzoic acid   

Question. CH₃OC₂H₅ and (CH₃)₃ C – OCH₃ are treated with hydroiodic acid. The fragments obtained after reactions are  
(a) CH₃I + HOC₂H₅; (CH₃)₃ Cl + HOCH₃
(b) CH₃OH + C₂H₅I; (CH₃)₃ Cl + HOCH₃
(c) CH₃OH + C₂H₅I; (CH₃)₃COH + CH₃I
(d) CH₃I + HOC₂H₅; CH₃I + (CH₃)₃ COH.

Question. Which of the following is a primary halide? 
(a) Iso-propyl iodide
(b) Secondary butyl iodide
(c) Tertiary butyl bromide
(d) Neohexyl chloride

Question. An organic compound X on treatment with pyridinium chlorochromate in dichloromethane gives compound Y. Compound Y reacts with I2 and alkali to form triiodomethane. The compound ‘X’ is      
(a) C₂H₅OH
(b) CH₃CHO
(c) CH₃COCH₃
(d) CH₃COOH

Question. The formation of diethyl ether from ethanol is based on :          
(a) Dehydrogenation reaction
(b) Hydrogenation reaction
(c) Dehydration reaction
(d) Heterolytic fission reaction

Question. Chloropicrin is obtained by the reaction of         
(a) steam on carbon tetrachloride 
(b) nitric acid on chlorobenzene
(c) chlorine on picric acid
(d) nitric acid on chloroform

Question. Ethanol can be prepared more easily by which reaction ?        
(i) CH₃CH₂Br + H₂O → CH₃CH₂OH
(ii) CH₃CH₂Br + Ag₂O (in boiling water)→ CH₃CH₂OH
(a) by (i) reaction
(b) by (ii) reaction
(c) Both reactions proceed at same rate
(d) by none

Question. An aromatic ether is not cleaved by HI even at 525 K. The compound is         
(a) C₆H₅OCH₃
(b) C₆H₅OC₆H₅
(c) C₆H₅OC₃H₇
(d) Tetrahydrofuran

Question. Ethanol when reacted with PCl5 gives A, POCl₃ and HCl. A reacts with silver nitrite to form B (major product) and AgCl. A and B respectively are         
(a) C₂H₅ C l and C₂H₅OC₂H₅ 
(b) C₂H₆ and C₂H₅OC₂H₅
(c) C₂H₅ C l and C₂H₅NO₂
(d) C₂H₆ and C₂H₅NO₂

Question. Polyvinylalcohol can be prepared by            
(a) polymerization of vinyl alcohol
(b) alkaline hydrolysis of polyvinyl acetate
(c) polymerization of acetylene
(d) reaction of acetylene with H₂SO₄ in presence of HgSO₄

Question. Which of the following fact(s) explain(s) as to why p-nitrophenol is more acidic than phenol?   
I. –I Effect of nitro group.
II. Greater resonance effect of p-nitrophenoxy group
III. Steric effect of bulky nitro group
(a) I and II
(b) I and III
(c) II and III
(d) II alone

Question. ClCH₂CH₂OH is stronger acid than CH₃CH₂OH because of:
(a) – I effect of Cl increases negative charge on O atom of alcohol
(b) – I effect of Cl disperses negative charge on O atom to produce more stable cation
(c) – I effect of Cl disperses negative charge on O atom to produce more stable anion
(d) None of these

Question. The ether that undergoes electrophilic substitution reactions is  
(a) CH₃OC₂H₅
(b) C₆H₅OCH₃
(c) CH₃OCH₃
(d) C₂H₅OC₂H₅

Question. A triglyceride can have how many different acyl groups?            
(a) 3
(b) 2
(c) 1
(d) 4

Question. In the Victor-Meyer’s test, the colour given by 1°, 2° and 3° alcohols are respectively.            
(a) red, colourless, blue
(b) red, blue, colourless
(c) blue, red, violet
(d) red, blue, violet.

Question. Which one of the following is not formed when glycerol reacts with HI ?       
(a) CH₃ — CHI — CH₃
(b) CH₃ — CH = CH₂
(c) CH₂OH — CHI — CH₂OH
(d) CH₂ = CH — CH₂I

Question. The reaction of Lucas reagent is fastest with:       
(a) (CH₃)₂CHOH
(b) CH₃(CH₂ )₂OH
(c) CH₃CH₂OH
(d) (CH₃)₃COH

Question. Following compounds are given:       
(i) CH₃CH₂OH (ii) CH₃COCH₃
(iii) CH₃ – CHOH
                   Í
                CH₃
(iv) CH₃OH
Which of the above compound(s), on being warmed with iodine solution and NaOH, will give iodoform?
(a) (i) and (ii)
(b) (i), (iii) and (iv)
(c) (i) only
(d) (i), (ii) and (iii)

Question. Ethanol when reacted with PCl₅ gives A, POCl₃ and HCl. A reacts with silver nitrite to form B (major product) and AgCl. A and B respectively are        
(a) C₂H₅ Cl and C₂H₅OC₂H₅
(b) C₂H₆ and C₂H₅OC₂H₅
(c) C₂H₅Cl and C₂H₅NO₂
(d) C₂H₆ and C₂H₅NO₂

Question. Phenol on reaction with Br₂ in non-polar aprotic solvent furnishes       
(a) 2, 4, 6-tribromophenol
(b) p-bromophenol
(c) o- and p-bromophenol
(d) m-bromophenol

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