MP BOARD CLASS-10th-12th Model Question Paper-2025-26

 

Class-XI M.P. Board

ALCOHOLS, PHENOLS AND ETHERS

Objective Type Questions

Q. 1. Choose the correct option:

1. What is tested by Lucas reagent:

(a) Aldehyde   (b) Phenol   (c) Alcohol     (d) Ether.

2. The nature of phenol is :

(a) Acidic (b) Alkaline (c) Amphoteric (d) Neutral.

3. On heating with chloroform and alkali, phenol forms

(a) Phthalic acid         (b) Hydroxyquinol

(c) Salicylaldehyde   (d) Ortho-hydroxy benzoic acid.

4. The reason for the excessive solubility of alcohol in water is

(a) Covalent bond (b) Ionic bond

(c) Hydrogen bonding with water

(d) None of the above.

5. Williamson synthesis is used in formation of:

(a) Alcohol   (b) Phenol   (c) Ether (d) Amine.

6. Ethers are isomeric

(a) Alcohol    (b) Phenol   (c) Ketone    (d) Amine.

7. Formaldehyde reacts with Grignard reagent to form

(a) Primary alcohol         (b) Secondary alcohol

(c) Tertiary alcohol           (d) Dihydric alcohol.

8. Which compound reacts with phthalic acid to give acid base indicator

(a) Chlorobenzene   (b) Phenol (c) Alcohol  (d) Ether.

9. Which is used for poisoning the alcohol

(a) Methyl alcohol (b) Phenol (c) Ethyl alcohol (d) Ether

10. Which is formed on heating ethyl alcohol with bleaching powder

(a) Diethyl ether             (b) Phenol

(c) Chlorobenzene           (d) Chloroform

11. Benzenediazonium chloride on reaction with phenol in weakly basic medium gives

(a) diphenyl ether       (b) p-hydroxyazobenzene

(c) chlorobenzene       (d) Benzene

12. Phenol reacts with bromine in CS₂ at low temperature to give

(a) m-bromophenol       (b) o-and p-bromophenol

(c) p-bromophenol       (d) 2,4,6-tribromophenol

13. When phenol is treated with excess bromine water it gives

(a) m-bromophenol         (b) o- and p-bromophenol

(c) 2,4-dibromophenol      (d) 2,4,6-tribromophenol

14. Phenol on reduction with H₂ in the presence of Ni catalyst gives

(a) benzene             (b) toluene

(c) cyclohexane         (d) Cyclohexanol

15. Dehydration of alcohol is an example of

(a) addition reaction        (b) elimination reaction

(c) substitution reaction      (d) redox reaction

16. The compound obtained by the reaction of ethene with diborane followed by hydrolysis with alkaline H₂O₂ is

(a) ethanol              (b) propanol  

(c) ethanol              (d) triethyl bromide

17. Which of the following is formed when phenol is exposed to air?

(a) o-Benzoquinone         (b) p-Benzoquinone

(c) Phenoquinone       (d) o-and p-Benzoquinone

18. Which of the following is formed when glycerol is heated with oxalic acid at 503K?

(a) Glyceric acid             (b) Acrolein

(c) Allyl alcohol             (d) Methanoic acid

19. The alcohol which does not react with Lucas reagent is

(a) isobutyl alcohol          (b) n-butanol

(c) tert-butyl alcohol         (d) sec-butyl alcohol

Q. 2. Fill in the blanks

1. Boiling point of alcohol is high due to the presence of............. (Hydrogen bonds)

2. When Vapour of primary alcohol is passed over hot alumina then ............... is formed (Alkene)

3. Lucas' reagent is a mixture of anhydrous ZnCl₂ and ....... of mixed in it (Conc. HCI)

4. Phenol heated with Zn powder to form (Benzene)

5. With excess amount of formaldehyde phenol condenses at high temperature to form............. (Bakelite polymer)

6. ........... alcohol is obtained by the destructive distillation of wood. (Methyl)

7. The nature of phenol is………… (Acidic)

8. Dipole moment of ether is than alcohol (less)

9............. is formed by the oxidation of secondary alcohol (Ketone)

10. ....... is used as an anaesthetic. chloroform

Q. 3. Answer in one word / sentence:

1. What is added to alcohol to make it undrinkable?

Methyl alcohol and Pyridine

2. What is formed on the dehydration of alcohol?

Alkene/ ether

3. Isomer of ether is Alcohol

4. Name the primary alcohol which gives iodoform test Ethyl alcohol

5. Write the state of hybridisation of carbon in alcohol and phenol.

In alcohol C is in sp³ and phenol is in sp² hybrid state

6. What is formed by the reaction of nitrous acid with primary amine  Primary alcohol

7. The process of slow decomposition of complex organic compounds by enzyme is called. Fermentation

8. What is carbolic acid ? Phenol.

9. Picric acid is a strong acid. Why?

In picric acid, acidic character increases due to the presence of three electron attracting -NO₂ groups because these groups are helpful in the release of H⁺. Thus picric acid is a strong acid.

10. Write the reagent required for the preparation of tertiary butyl alcohol starting from propanone.
Methyl magnesium bromide.

11. What type of isomerism is exhibited between alcohol and ether?

Alcohol and ether exhibit Functional isomerism.

12. Why do ethers have low boiling points?
Molecules of ether do not possess H – bonding, therefore boiling points of ethers are low.

13. What is Lucas reagent? How are primary, secondary and tertiary alcohol identified by it?

Mixture of anhydrous ZnCl₂ and cone. HCl is known as Lucas reagent.

1. Tertiary Alcohol : On adding Lucas reagent in alcohol at normal temperature, immediately white oily precipitate of Alkyl chlorides is formed, then it is tertiary alcohol.

2. Secondary Alcohol : If on adding Lucas reagent in alcohol, at normal temperature, a white oily precipitate of alkyl chloride is obtained after 5 minutes, then it is secondary alcohol.

3. Primary Alcohol : Primary alcohol does not show any reaction with Lucas reagent at normal temperature.
14. Name the reagents used in the following reactions: (NCERT)

1. Oxidation of a primary alcohol to carboxylic acid.

Acidified K₂Cr₂O₇ or neutral acidic or alkaline KMnO₄.

2. Oxidation of a primary alcohol to aldehyde.

Pyridinium chlorochromate (pcc) in CH₂Cl₂ or Cu at 573K.

1. Bromination of phenol to 2,4,6 – tribromo – phenol.

Bromine water (Br₂/H₂O)

3.  

4. Benzyl alcohol to benzoic acid

Acidified or alkaline KMnO₄

5. Dehydration of propan – 2 – ol to propene

Conc. H₂SO₄ at 443K or 85% phosphoric acid at 443K.

6. Butan – 2 – one to butan – 2 – ol.

2. Ni/H₂ or NaBH₄ or LiAlH₄.

15. Differentiate between Phenol and Alcohol Differences between Phenol and Alcohol

Phenol

• Physical properties – Characteristic phenolic odour, sparingly soluble in water.
• It is acidic and dissolve in bases to form salt.
• On oxidation, hybrid coloured product is formed.
• Produce characteristic colour with Ferric chloride.
• It does not react with halogen acid.
• With PC₁₅, mainly form triaryl phosphate.

Alcohol

• Pleasant odour, fairly soluble in water.
• It is neutral and do not reacts with bases.
• It can easily oxidize to Aldehydes and ketones.
• It does not reacts with ferric chloride.
• Forms Alkyl halide.
• Alkyl chloride are formed. 
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