VBQs Alcohols Phenols and Ethers Class 12 Chemistry with Alcohols Phenols and Ethers has been provided below for standard students. We have provided chapter wise VBQ for Class 12 Chemistry with Alcohols Phenols and Ethers. The following Alcohols Phenols and Ethers Class 12 Chemistry value based questions with answers will come in your exams. Students should understand the concepts and learn the solved cased based VBQs provided below. This will help you to get better marks in class 12 examinations.
Alcohols Phenols and Ethers VBQs Class 12 Chemistry
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. In the reaction
(a) benzaldehyde
(b) chlorobenzene
(c) benzoic acid
(d) salicylic acid
Answer
D
Question. What is the correct order of reactivity of alcohols in the following reaction?
Answer
C
Question. The hydrocarbon which produce phenol and acetone as a by product in the large quantity is
Answer
D
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. Mark the correct increasing order of reactivity of the following compounds with HBr/HCl
(a) A < B < C
(b) B < A < C
(c) B < C < A
(d) C < B < A
Answer
C
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. In the reaction
Phenol behaves as
(a) Bronsted base
(b) Bronsted acid
(c) Lewis acid
(d) Lewis base
Answer
B
Question. In the given reaction
Answer
B
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. For the reaction,
the order of reactivity is
(a) HBr > HI > HCl
(b) HI > HCl > HBr
(c) HI > HBr > HCl
(d) HCl > HBr > HI
Answer
C
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
(a) A – (q), B – (p), C – (s), D – (r)
(b) A – (r), B – (p), C – (s), D – (q)
(c) A – (s), B – (q), C – (p), D – (r)
(d) A – (q), B – (r), C – (s), D – (p)
Answer
D
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