Alcohols Phenols and Ethers HOTs Class 12 Chemistry

Please refer to Alcohols Phenols and Ethers HOTs Class 12 Chemistry provided below with solutions. All HOTs for Class 12 Chemistry with answers provided below have been designed as per the latest syllabus and examination petter issued by CBSE, NCERT, KVS. Students of Standard 12 Chemistry should learn the solved HOTS for Class 12 Chemistry provided below to gain better marks in examinations.

Alcohols Phenols and Ethers Class 12 Chemistry HOTs

Question. Sodium salt of benzene sulphonic acid on fusion with caustic soda gives
(a) Benzene
(b) Phenol
(c) Thiophenol
(d) Benzoic acid

Question. Which of the following is dihydric alcohol ?
(a) Glycerol
(b) Ethylene glycol
(c) Catechol
(d) Resorcinol

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

Question. Butane-2-ol is
(a) primary alcohol
(b) secondary alcohol
(c) tertiary alcohol
(d) aldehyde

Question. Cresol has
(a) Alcoholic – OH
(b) Phenolic – OH
(c) – COOH
(d) – CHO

Question. By which of the following methods alcohol can be prepared in excellent yield?
(a) From alkenes
(b) By hydroboration-oxidation
(c) From carbonyl compounds
(d) From Grignard reagent

Question. How many isomers of C₅H₁₁OH will be primary alcohols ?
(a) 5
(b) 4
(c) 2
(d) 3

Question. The IUPAC name of

(a) 1, 1-dimethyl-1, 3-butanediol
(b) 2-methyl-2, 4-pentanediol
(c) 4-methyl-2, 4-pentanediol
(d) 1, 3, 3-trimethyl-1, 3-propanediol

Question. Number of metamers represented by molecular formula C₄H₁₀O is
(a) 4
(b) 3
(c) 2
(d) 1

Question. The structural formula of cyclohexanol is

Question. How many alcohol(s) with molecular formula C₄H₁₀O are chiral in nature?
(a) 1
(b) 2
(c) 3
(d) 4

Question. IUPAC name of m-cresol is ___________
(a) 2-methylphenol
(b) 3-chlorophenol
(c) 3-methoxyphenol
(d) benzene-1, 3-diol

Question. Which of the following will not form phenol or phenoxide ?
(a) C₆H₅N₂Cl
(b) C₆H₅SO₃Na
(c) C₆H₅Cl
(d) C₆H₅CO₂H

Question. IUPAC name of the compound

(a) 1-methoxy-1-methylethane
(b) 2-methoxy-2-methylethane
(c) 2-methoxypropane
(d) isopropylmethyl ether

Question. Which of the following compounds is aromatic alcohol?

(a) A, B, C, D
(b) A, D
(c) B, C
(d) A

Question. In which of the following structures hydroxyl group is attached to sp² carbon atom?

Question. Alkenes convert into alcohols by
(a) hydrolysis by dil. H₂SO₄
(b) hydration of alkene by alkaline KMnO₄
(c) hydrolysis by water vapours and conc. HNO₃
(d) hydration of alkene by aqueous KOH

Question. Benzyl alcohol is obtained from benzaldehyde by
(a) Fittig’s reaction
(b) Cannizzaro’s reaction
(c) Kolbe’s reaction
(d) Wurtz’s reaction

Question. Give IUPAC name of the compound given below

(a) 2-Chloro-5-hydroxyhexane
(b) 2-Hydroxy-5-chlorohexane
(c) 5-Chlorohexane-2-ol
(d) 2-Chlorohexan-5-ol

Question. An example of a compound with functional group – O – is :
(a) acetic acid
(b) methyl alcohol
(c) diethyl ether
(d) acetone

Question. In the reduction
R — CHO + H₂ → RCH₂OH the catalyst used is :
(a) Ni
(b) Pd
(c) Pt
(d) Any of these

Question. The compound HOCH₂ – CH₂OH is
(a) ethane glycol
(b) ethylene glycol
(c) ethylidene alcohol
(d) dimethyl alcohol

Question. Ethylene reacts with Baeyer’s reagent to give
(a) ethane
(b) ethyl alcohol
(c) ethylene glycol
(d) None of these

Question. Which of the following reacts with NaOH to give an alcohol?
(a) Propene
(b) Butene
(c) Ethanal
(d) Methanal

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

Question. The characteristic grouping of secondary alcohols is

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

Question. Which of the following is an example of unsymmetrical ether?
(a) C₂H₅OC₂H₅
(b) C₆H₅OC₆H₅
(c) C₆H₅OC₂H₅
(d) CH₃OCH₃

Question. Isopropyl alcohol is obtained by reacting which of the following alkenes with concentrated H₂SO₄ followed by boiling with H₂O?
(a) Ethylene
(b) Propylene
(c) 2-Methylpropene
(d) Isoprene

Question. Which of the following are benzylic alcohols?
(i) C₆H₅ – CH₂ – CH₂OH
(ii) C₆H5 – CH₂OH

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (i) and (iv)

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

Question. The major organic product in the reaction,
CH₃ — O — CH(CH₃)₂ + HI → Product is

Question. Formation of diethyl ether from ethanol is based on a
(a) dehydration reaction
(b) dehydrogenation reaction
(c) hydrogenation reaction
(d) heterolytic fission reaction

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. Methylphenyl ether can be obtained by reacting
(a) phenolate ions and methyl iodide
(b) methoxide ions and bromobenzene
(c) methanol and phenol
(d) bromo benzene and methyl bromide

Question. Diethyl ether can be decomposed by heating with
(a) HI
(b) NaOH
(c) Water
(d) KMnO₄

Question. The cleavage of an aryl-alkyl ether with cold HI gives :
(a) alkyl iodide and water
(b) aryl iodide and water
(c) alkyl iodide, aryl iodide and water
(d) phenol and alkyl iodide

Question.. When 2-methoxypropane is heated with HI, in the mole ratio 1 : 1, the major products formed are
(a) methanol and 2-iodopropane
(b) methyl iodide and 2-propanol
(c) methyl iodide and 2-iodopropane
(d) methanol and 2-propanol

STATEMENT TYPE QUESTIONS

Question. Read the following statements and choose the correct option.
(i) Ethanol on dehydration at 443 K gives ethene
(ii) Ethanol on dehydration at 413 K gives diethyl ether
(iii) Only primary alcohols on dehydration give ethers.
(iv) Secondary and tertiary alcohols on dehydration give ethers having 2° and 3° carbon attached with O atom.
(a) TTFF
(b) TFTF
(c) TTTF
(d) FTTF

Question. Which of the following are correct statement(s) ?
(i) Polar nature of O–H bond is responsible for acidic character of alcohols.
(ii) Acidic strength of alcohols follow the order 1° > 2° > 3°.
(iii) Alcohols are stronger acids than water.
(iv) Alcohols also react as Bronsted base.
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (ii), (iii) and (iv)
(d) (i), (iii) and (iv)

Question. Which of the following statements are correct ?
(i) Ethanol mixed with methanol is called denatured alcohol.
(ii) Excess of methanol in body may cause blindness.
(iii) In the body methanol is oxidised to methanoic acid.
(iv) A methanol poisoned patient is treated by giving intravenous injections of ethanoic acid.
(a) (i), (ii) and (iii)
(b) (ii), (iii) and (iv)
(c) (i) and (v)
(d) (i), (iii) and (iv)

Question. When an alcohol is prepared by reaction of ethylmagnesiumbromide with 2–pentanone, product formed does not rotate plane polarised light. For this reaction which of the following statement(s) is/are correct ?
(i). Product formed is achiral.
(ii) Racemic mixture is formed.
(a) Both statements (i) and (ii) are correct.
(b) Statement (i) is correct only.
(c) Statement (ii) is correct only.
(d) Both statements (i) and (ii) are incorrect.

Question. Which of the following statements are correct ?
(i) In phenols, the —OH group is attached to sp² hybridised carbon of an aromatic ring
(ii) The carbon – oxygen bond length (136 pm) in phenol is slightly more than that in methanol
(iii) Partial double bond character is due to the conjugation of unshared electron pair of oxygen with the aromatic ring.
(iv) sp² hybridised state of carbon to which oxygen is attached.
(a) (i), (ii) and (v)
(b) (i), (ii) and (iii)
(c) (i), (iii) and (iv)
(d) (i) and (iv)

Question. Which of the following statements are correct ?
(i) Alcohols react as nucleophiles in the reactions involving cleavage of O–H bond.
(ii) Alcohols react as electrophiles in the reactions involving cleavage of O–H bond.
(iii) Alcohols react as nucleophile in the reaction involving cleavage of C–O bond.
(iv) Alcohols react as electrophiles in the reactions involving C–O bond.
(a) (i) only
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) only