MCQ Chapter 11 Alcohols Phenols and Ethers Class 12 Chemistry

Please refer to Alcohols Phenols and Ethers MCQ Questions Class 12 Chemistry below. These MCQ questions for Class 12 Chemistry with answers have been designed as per the latest NCERT, CBSE books and syllabus issued for the current academic year. These objective questions for Alcohols Phenols and Ethers will help you to prepare for the exams and get more marks.

Alcohols Phenols and Ethers MCQ Questions Class 12 Chemistry

Please see solved MCQ Questions for Alcohols Phenols and Ethers in Class 12 Chemistry. All questions and answers have been prepared by expert faculty of standard 12 based on latest examination guidelines.

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     

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     

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     

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     

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

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       

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

Question. 

Identify A and B
(a) Phenol, acetone
(b) Phenol, acetaldehyde
(c) Benzoic acid, acetone
(d) Benzaldehyde, ethano         

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       

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   

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

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   

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       

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       

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⁺     

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

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

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)       

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

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       

Question. The product X is

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   

Question. The correct statement regarding the following compounds is 

(a) all three compounds are chiral
(b) Only I and II are chiral
(c) I and III are diastereomers
(d) Only I and III are chiral       

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     

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       

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     

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)     

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

Question.

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

Question. The final product (IV) in the sequence of reactions

Question. 0.44 g of a monohydric alcohol when added to methylmagnesiurn iodide in ether liberates at STP, 112cm³ of methane. With PCC the same alcohol forms a carbonyl compound that answers silver mirror test. The monohydric alcohol is

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       

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

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   

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     

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     

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       

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

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       

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       

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

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⁺   

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     

Question. Which one of the following will most reaclily be dehydrated in aciclic conclitions ? 

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   

Question. The main product of the following reaction is

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

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         

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     

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     

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   

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     

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

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. 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   

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

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   

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

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       

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