CBSE Class 12 Chemistry Alcohols Phenols and Ethers MCQs Set D

Question: Which of the following combinations can be used to synthesise ethanol? 
(a) CH₃ Mgiand CH₃COCH₃
(b) CH₃ Mgland C₂H₅OH
(c) CH₃ Mgi and CH₃COOC₂H₅
(d) CH₃ Mgland HCHO
Answer: d

Question: Argol, a brown cmst, formed during the fermentation of grape juice contains 
(a) CO₂
(b) fused oil
(c) potassium hydrogen tartarate
(d) lye
Answer: c

Question: The enzymes which are used to convert starch into ethyl alcohol are
(a) maltase, diastase
(b) diastase, maltase, zymase
(c) invertase, zymase
(d) invertase, diastase, maltase
Answer: b

Question: Grignard reagent reacts with HCHO to produce 
(a) secondary alcohol
(b) anhydride
(c) acid
(d) primary alcohol
Answer: d

Question: Reimer-Tiemann reaction involves
(a) carbonium ion intem1ediate
(b) carbene intermediate
(c) carbanion intermediate
(d) free radical intennediate
Answer: b

 Question: Lucas test is associated with 
(a) aldehydes
(b) phenols
(c) carboxylic acids
(d) alcohols
Answer: d

Question: Among the alkenes which one produces tertiary butyl alcohol on acid hydration? 
(a) CH₃CH₂CH=CH₂
(b) CH₃CH=CH—CH₃
(c) (CH₃)₂C=CH₂
(d) CH₃—CH=CH₂
Answer: c

Question: Ketone upon treatment with Grignard reagent gives
(a) primary alcohol
(b) secondary alcohol
(c) tertiary alcohol
(d) aldehyde
Answer: c 

Question: The density of glycerol is higher than propanol due to
(a) van der Waals' attraction
(b) hydrogen bonding
(c) ionic bonding
(d) more number of covalent bonds
Answer: b

Question: RCH₂CH₂OH can be converted to RCH₂CH₂COOH by the following sequence of steps
(a) PBr₃ , KCN, H₃O⁺
(b) PBr₃ , KCN, H₂ /P⁺
(c) KCN, H₃O⁺
(d) HCN, PBr₃ , H₃O⁺
Answer: a

Question: In Lucas test an alcohol reacts immediately and gives insoluble chloride. The alcohol is 
(a) CH₃OH
(b) CH₃CH₂OH
(c) (CH₃)₂ CHOH
(d) (CH₃)₃ COH 
Answer: c 

Question: Ethanol is CH₃CH₂OH. Which species is formed when ethanol acts as a Bronsted base? 
(a) CH₃CH₂O^-
(c) CH₃CH₂O⁺H₂
(b) CH₃C⁺ H₂
(d) H₃O⁺
Answer: c

Question: The compound which gives turbidity immediately with Lucas reagent at room temperature is 
(a) butan-1-ol
(b) butan-2-ol
(c) 2-methyl propan-2-ol
(d) 2-methyl propan-1 -ol
Answer: c

Question: Which of the following alcohol is unable to tum orange colour of chromic acid to green? 
(a) 1° alcohol
(b) 2° alcohol
(c) 3° alcohol
(d) Allyl alcohol
Answer: c 

Question: Ethylene can be converted into alcohol by treatment of
(a) Aq. KOH
(b) H₂SO₄ as catalyst
(c) Moist silver oxide
(d) Zn/HCI
Answer: b

Question: The most suitable reagent for the conversion of
R—CH₂—OH→ R—CHOis 
(a) K.MnO₄
(b) K₂Cr₂O₇
(c) CrO₃
(d) PCC (pyridiniurn chlorochromate)
Answer: d

Question: Ethyl alcohol can be prepared from Grignard reagent by the reaction of
(a) HCHO
(b) R₂CO
(c) RCN
(d) RCOCl
Answer: a

Question: Power alcohol is a mixture of
(a) 80% petrol + 20% ethanol + small quantity of benzene
(b) 80% ethanol + 20% benzene + small quantity of petrol
(c) 50% petrol + 50%ethanol + small quantity ofbenzene
(d) 80% petrol + 20% benzene + small quantity of ethanol 
Answer: a 

Question: The correct combination of names for isomeric alcohols with molecular formula C₄ H₁₀O is/are
(a) tert-butanol and 2-methyl propan-2-ol
(b) tert-butanol and 1, 1-dimethy 1 ethan-1-ol
(c) n-butanol and butan-1-ol
(d) iso-butyl alcohol and 2-methyl propan-1-ol
Answer: c

Question: An unknown alcohol is treated with the "Lucas reagent" to determine wheter the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism? 
(a) Secondary alcohol by S_N1
(b) Tertiary alcohol by S_N2
(c) Secondary alcohol by S_N2
(d) Tertiary alcohol by S_N1
Answer: d

Question: An oxygen containing organic compound upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound is
(a) an aldehyde
(b) a primary alcohol
(c) a secondary alcohol
(d) a ketone
Answer: b

Question: The function of ZnCl₂ in Lucas test for alcohols is
(a) to act as acid catalyst and react with HCl to form H₂ ZnCI₄
(b) to act as base catalyst and react with NaOH to form Na₂Zn(OH)₄
(c) to act as amphoteric catalyst
(d) to act as neutral catalyst
Answer: a

Question: Salicyl aldehyde is obtained when phenol is heated with CHCl₃ and aqueous NaOH. This reaction is known by which name? 
(a) Carbyl amine reaction
(b) Hofmann's reaction
(c) Reimer-Tiemann reaction
(d) Kolbe-Schmidt reaction
Answer: c

Question: The reaction of phenol with excess ofbromine water gives
(a) 11rbromophenol 
(b) o-and p-bromophenol
(c) 2, 4-clibromophenol
(d) 2, 4, 6-tribromophenol
Answer: d

 Question: In the following sequence of reactions,
CH₃CH₂OH→^P+I₂ A→^Mg_ether B→^HCHO C→^H₂OD the compound 'D' is 
(a) butanal
(b) n-butyl alcohol
(c) n-propyl alcohol
(d) propanal
Answer: c

 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
Answer: a

Question: In fermentation by zymase, alcohol and CO₂ are obtained from 
(a) invert sugar
(b) glucose
(c) fructose
(d) A.II of these
Answer: b 

Question: In the conversion of ethanol into methanol which of the following reagents will be used?
(a) K₂Cr₂O₇ /H₂SO₄
(b) NaOH + CaO
(c) Cl₂ + aq. KOH
(d) All of these
Answer: d 

Question: Hydrogen bonding is maximum in 
(a) diethyl ether
(b) triethyl amine
(c) ethanol
(d) None of these
Answer: c

Question: When ethylene glycol is heated with acidified potassium permanganate, the main organic compound obtained is
(a) oxalic acid 
(b) glyoxal
(c) formic acid
(d) acetaldehyde
(e) 2-hydroxy ethanol 
Answer: c

Question: The relative case of dehydration following order of alcohols follows
(a) tertiary > secondary > primary
(b) primary > secondary > tertiary
(c) secondary > tertiary > primary
(d) tertiary > primary > secondary 
Answer: a 

Question: The best method to prepare cyclohexene from cyclohexanol is by using
(a) cone. HCl + ZnCI₂
(b) cone. H₃PO₄
(c) HBr
(d) cone. HCl
Answer: b

Question: Primary, secondary and tertiary alcohols are clistinguished from one another by 
(a) Ninhydrin test
(b) Tollen's reagent
(c) Lucas test
(d) Wittig reaction
Answer: c

Question: Hydroboration oxidation of 4-methyl octene-1 would give
(a) 4-methyl octanol 
(b) 2-methyl decane
(c) 4-methyl heptanol
(d) 4-methyl-2-octanone
Answer: a

Question: C6H5—CH=CHCHO—^X C₆H₅CH= CHCH₂OH
In the above sequence X can be
(a) H₂ /Ni
(b) NaBH₄
(c) K₂Cr₂O₇ /H⁺
(d) Both (a) and (b)
Answer: b

Question: The compound on dehydrogenation gives a ketone. The original compound is 
(a) primary alcohol
(b) secondary alcohol
(c) tertiary alcohol
(d) carboxylic acid
Answer: b

 Question: The alcohol obtained by the hydrolysis of oils and fats is
(a) glycol
(b) glycerol 
(c) propanol
(d) pentanol
Answer: b

Question: From amongst the following alcohols the one that would react fastest with cone. HCl and anhydrous ZnCI₂ is
(a) 2-butanol
(b) 2-methyl propan-2-ol
(c) 2-methylpropanol
(d) 1 butanol
Answer: b

Question: Which compound will have highest boiling point?
(a) CH₄
(b) CH₃OH 
(c) C₂H₅OH
(d) HCHO
Answer: c

Question: Identify the product/s in the following reaction.
3CH₃ CH=CH₂ →^BH₃ X →^H₂O₂/OH- products + H₃BO₃ 
(a) CH₃CH₂CH₂OH
(b) CH₃CHOHCH₃
(c) CH₃CH₂CHO
(d) CH₃CH₂OH + CH₃OH
(e) CH₃CHO + CH₃OH
Answer: a

Question: The—OH group of an alcohol or the—COOH group of a carboxylic acid can be replaced by—Cl using 
(a) phosphorus pentachloride
(b) hypochlorous acid
(c) chlorine
(d) hydrochloric acid
Answer: a

Question: Which one of the following properties is exhibited by phenol? 
(a) It is soluble in aq. NaOH and evolves CO₂ with aq. NaHCO₃
(b) It is soluble is aq. NaOH and does not evolve CO, with aq. NaHCO₃ 
(c) It is not soluble in aq. NaOH but evolves CO₂ with aq. NaHCO₃ 
(d) It is insoluble in aq. NaOH and does not evolve CO₂ with aq. NaHCO₃
Answer: b

Question: The reaction involved in the oil of winter green test is salicylic acid →^Δ _{Cone. H2SO4} product. The product is treated with Na₂CO₃ solution. The missing reagent in the above reaction is
(a) phenol
(b) NaOH
(c) ethanol
(d) methanol
Answer: d

Question: Catalytic dehydrogenation of a primary alcohol gives a
(a) secondary alcohol
(b) aldehyde
(c) ketone
(d) ester
Answer: b

Question: Acid catalysed hydration of alkenes except ethene leads to the formation of 
(a) mixture of secondary and tertiary alcohols
(b) mixture of primary and secondary alcohols
(c) secondary or tertiary alcohol
(d) primary alcohol
Answer: c 

Question: Upon treatment with I₂ and aqueous NaOH, which of the following compounds will fotm iodoform? 
(a) CH₃CH₂CH₂CH₂CHO
(b) CH₃CH₂COCH₂CH₃
(c) CH₃CH₂CH₂CH₂CH₂OH
(d) CH₃CH₂CH₂CH(OH)CH₃
Answer: d

Question: Ethylene glycol gives oxalic acid on oxidation with
(a) acidified K₂Cr₂O₇
(b) acidified KMnO₄
(c) alkaline KMnO₄
(d) periodic acid
Answer: c

Question: In the reaction, CH₃OH →^Oxidation A →^NH₃ B; A and B are 
(a) HCHO, HCOONH₄
(b) HCOOH, HCOONH₄
(c) HCOOH, HCONH₂
(d) HCHO, HCONH₂ 
Answer: b

Question: Pinacol is 
(a) 3-methylbutan-2-ol
(b) 2, 3-dimethyl-2, 3-butaned:iol
(c) 2, 3-dimethyl-2-propanone
(d) None of the above
Answer: b

Question: The correct statement with respect to product Y is
(a) it gives a positi:i,e Tollen's test and is a functional isomer of X
(b) it gives a positive Tollen's test and is a geometrical isomer of X
(c) it gives a positive iodoform test and is a functional isomer of X
(d) it gives a positive iodoform test and is a geometrical isomer of X
Answer: c

Question: When compound X is oxidised by acidified potassium dichromate, compound Y is formed. Compound Y on reduction with LiAIH₄ gives X. X and Y respectively are
(a) C₂H₅OH, CH₃COOH 
(b) CH₃COCH₃ , CH₃COOH
(c) C₂H₅OH, CH₃COCH₃
(d) CH₃CHO, CH₃COCH₃
Answer: a

Question: For the sequence of reactions,
A →^C₂H₅Mgl B → ^H₂O/H+ tert-pentyl alcohol.
The compound A in the sequence is 
(a) 2-butanone
(b) acetaldehyde
(c) acetone
(d) propanal 
Answer: c

 Question: Which among the following compounds will give a secondary alcohol on reacting with Grignard's reagent followed by acid hydrolysis ?
I. HCHO
II. C₂H₅CHO
III. CH₃COCH₃
IV. C₂H₅COOH
Select the correct answer using the codes given below.
(a) Only II
(b) Only III 
(c) I and IV
(d) II and IV
Answer: a