CBSE Class 12 Chemistry Alcohols Phenols and Ethers MCQs Set 05

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
Answer: a

Question. Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives
(a) 2, 4, 6-trinitrobenzene
(b) o-nitrophenol
(c) p-nitrophenol
(d) nitrobenzene
Answer: b

Question. Which of the following cannot be made by using Williamson’s synthesis?
(a) Methoxybenzene
(b) Benzyl p-nitrophenyl ether
(c) Methyl tertiary butyl ether
(d) Di-tert-butyl ether
Answer: d

Question. 3 moles of ethanol react with one mole of phosphorus tribromide to form 3 moles of bromoethane and one mole of X. Which of the following is X?
(a) H₃PO₄
(b) H₃PO₂
(c) HPO₃
(d) H₃PO₃
Answer: d

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 compounds will react with sodium hydroxide solution in water?
(a) C₆H₅OH
(b) C₆H₅CH₂OH
(c) (CH₃)₃COH
(d) C₂H₅OH
Answer: a

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
Answer: a

Question. Monochlorination of toluene in sunlight followed by hydrolysis with aq. NaOH yields.
(a) o-Cresol
(b) m-Cresol
(c) 2, 4-Dihydroxytoluene
(d) Benzyl alcohol
Answer: d

Question. Aspirin is an acetylation product of
(a) p-Dihydroxybenzene
(b) o-Hydroxybenzoic acid
(c) o-Dihydroxybenzene
(d) m-Hydroxybenzoic acid
Answer: b

Question. An ether is more volatile than an alcohol having the same molecular formula. This is due to
(a) dipolar character of ethers
(b) alcohols having resonance structures
(c) inter-molecular hydrogen bonding in ethers
(d) inter-molecular hydrogen bonding in alcohols
Answer: d

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. 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. The fermentation reactions are carried out in temperature range of
(a) 20-30°C
(b) 30-40°C
(c) 40-50°C
(d) 50-60°C
Answer: a

Question. Ether can be used
(a) as a general anaesthetic
(b) as a refrigerant
(c) in perfumery
(d) all of the above
Answer: d

Question. Methyl alcohol is toxic. The reason assigned is
(a) it stops respiratory track
(b) it reacts with nitrogen and forms CN– in the lungs
(c) it increses CO₂ content in the blood
(d) it is a reduction product of formaldehyde
Answer: b

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. Which enzyme converts glucose and fructose both into ethanol ?
(a) Diastase
(b) Invertase
(c) Zymase
(d) Maltase
Answer: c

Question. Phenol is less acidic than_______________ .
(a) ethanol
(b) o–nitrophenol
(c) o-methylphenol
(d) o-methoxyphenol
Answer: b

Question. Tonics in general contain
(a) Ether
(b) Methanol
(c) Ethanol
(d) Rectified spirit
Answer: c

Question. Methanol and ethanol can be distinguished by the following:
(a) By reaction with metallic sodium
(b) By reaction with caustic soda
(c) By heating with iodine and washing soda
(d) By heating with zinc and inorganic mineral acid
Answer: c

Question. Williamson’s synthesis is used to prepare
(a) acetone
(b) diethyl ether
(c) P.V.C.
(d) bakelite
Answer: b

Question. Denaturation of alcohol is the
(a) mixing of CuSO₄ (a foul smelling solid) and pyridine (to give the colour) to make the commercial alcohol unfit for drinking
(b) mixing of CuSO₄ (to give the colour) and pyridine (a foul smelling solid) to make the commercial alcohol unfit for drinking
(c) mixing of Cu(OAc)₂ and ammonia to make the commercial alcohol unfit for drinking
(d) mixing of Cu(OAc)₂ and pyridine to make the commercial alcohol unfit for drinking
Answer: b

Question. In order to make alcohol undrinkable pyridine and methanol are added to it. The resulting alcohol is called
(a) Power alcohol
(b) Proof spirit
(c) Denatured spirit
(d) Poison alcohol
Answer: c

Question. The reaction of sodium ethoxide with ethyl iodide to form diethyl ether is termed
(a) electrophilic substitution
(b) nucleophilic substitution
(c) electrophilic addition
(d) radical substitution
Answer: b

Question. The reaction given below is known as
C₂H₅ONa + IC₂H₅ → C₂H₅OC₂H₅ + NaI
(a) Kolbe’s synthesis
(b) Wurtz synthesis
(c) Williamson’s synthesis
(d) Grignard’s synthesis
Answer: c

Question. Wine (alcoholic beverages) contains
(a) CH₃OH
(b) Glycerol
(c) C₂H₅OH
(d) 2-propanol
Answer: c

Question. Ether which is liquid at room temperature is
(a) C₂H₅OCH₃
(b) CH₃OCH₃
(c) C₂H₅OC₂H₅
(d) None of these
Answer: c

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: b

Question. Arrange the following in increasing order of their acidity?
o–cresol(a), salicyclic acid(b), phenol(c)
(a) c < a < b
(b) b < c < a
(c) a < b < a
(d) a < c < b
Answer: d

Question. Which of the following compound is soluble in ether?
(a) Oils and fats
(b) Water
(c) NaCl
(d) PCl₅
Answer: a

Question. Ethanol is prepared industrially by
(a) hydration of ethylene
(b) fermentation of sugar
(c) Both the above
(d) None of these
Answer: c

Question. CH₃CH₂OH can be converted into CH₃CHO by ________
(a) catalytic hydrogenation
(b) treatment with LiAlH₄
(c) treatment with pyridinium chlorochromate
(d) treatment with KMnO₄
Answer: c

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
Answer: a

MATCHING TYPE QUESTIONS

Question. Match the columns
Column-I                                          Column-II
(A) Methanol                              (p) Conversion of phenol to o-hydroxysalicylic acid
(B) Kolbe’s reaction                    (q) Wood spirit
(C) Williamson’s synthesis         (r) Heated copper at 573 K
(D) Conversion of 2° alcohol      (s) Reaction of alkyl halide with sodium alkoxide to ketone
(a) A – (s), B – (r), C – (q), D – (p)
(b) A – (q), B – (s), C – (p), D – (r)
(c) A – (q), B – (p), C – (s), D – (r)
(d) A – (r), B – (q), C – (p), D – (s)
Answer: c

Question. Match the columns
Column-I                                     Column-II 
(A) Antifreeze used in             (p) Methanol
      car engine
(B) Solvent used in                 (q) Phenol
      perfumes
(C) Starting material for          (r) Ethleneglycol
       picric acid
(D) Wood spirit (s) Ethanol
(a) A – (s), B – (q), C – (p), D – (r)
(b) A – (r), B – (s), C – (q), D – (p)
(c) A – (s), B – (q), C – (r), D – (p)
(d) A – (p), B – (r), C – (q), D – (s)
Answer: b