NEET UG - Alcohols phenols ethers aldehydes ketones carboxylic acids preparation properties reactions and important tests Question Bank with Options

1. The Cannizzaro reaction is shown by aldehydes that:

A) Have alpha-hydrogens

B) Lack alpha-hydrogens

C) Are primary alcohols

D) Are ketones

2. Which of the following alcohols is used as an antifreeze?

A) Methanol

B) Ethanol

C) Ethylene glycol

D) Glycerol

3. What is the main product when phenol reacts with phosgene (COCl2)?

A) Phenyl acetate

B) Diphenyl carbonate

C) Phenyl chloroformate

D) Salicylic acid

4. Which compound gives a positive test with sodium bicarbonate solution?

A) Ethanol

B) Phenol

C) Acetic acid

D) Diethyl ether

5. The Reimer-Tiemann reaction is used to introduce an aldehyde group onto the ring of:

A) Benzene

B) Toluene

C) Phenol

D) Aniline

6. Which of the following is a characteristic reaction of ethers?

A) Nucleophilic addition

B) Electrophilic substitution

C) Cleavage by strong acids

D) Oxidation

7. What is the product of esterification of a carboxylic acid with an alcohol in the presence of an acid catalyst?

A) Ether

B) Anhydride

C) Ester

D) Amide

8. Which reagent is used in the Wolff-Kishner reduction?

A) Zn(Hg)/HCl

B) LiAlH4

C) Hydrazine and strong base

D) Na/Ethanol

9. The Clemmensen reduction is used to reduce:

A) Aldehydes and ketones to alkanes

B) Carboxylic acids to alcohols

C) Esters to aldehydes

D) Alcohols to alkanes

10. What is the product when acetaldehyde reacts with HCN?

A) Acetaldehyde cyanohydrin

B) Lactic acid

C) Acetic acid

D) Ethyl cyanide

11. Which of the following reactions is characteristic of phenols and not alcohols?

A) Esterification

B) Ether formation

C) Electrophilic aromatic substitution

D) Oxidation

12. The Kolbe reaction is used for the carboxylation of:

A) Alcohols

B) Ethers

C) Phenols

D) Aldehydes

13. What is the Hell-Volhard-Zelinsky (HVZ) reaction used for?

A) Alpha-halogenation of carboxylic acids

B) Oxidation of primary alcohols

C) Preparation of esters

D) Reduction of ketones

14. The reaction of an aldehyde with sodium bisulfite forms a:

A) Bisulfite addition product

B) Alcohol

C) Carboxylic acid

D) Ether

15. Which of the following is a method for preparing ethers?

A) Oxidation of alcohols

B) Dehydration of alcohols

C) Reduction of aldehydes

D) Reaction of acid chlorides with alcohols

16. Phenols are more acidic than alcohols due to:

A) Resonance stabilization of the phenoxide ion

B) Inductive effect of the phenyl group

C) Hydrogen bonding

D) The presence of the hydroxyl group

17. What is the primary use of ethanol in industry?

A) As a solvent

B) As a fuel

C) As a disinfectant

D) As a precursor for other chemicals

18. Which alcohol is known as wood alcohol?

A) Ethanol

B) Methanol

C) Propanol

D) Butanol

19. What is the common name for propanone?

A) Acetone

B) Methyl ethyl ketone

C) Diethyl ketone

D) Propyl ketone

20. What is the common name for methanal?

A) Acetaldehyde

B) Formaldehyde

C) Propionaldehyde

D) Butyraldehyde

21. Which of the following alcohols can be prepared by the reduction of a carboxylic acid?

A) Primary alcohols

B) Secondary alcohols

C) Tertiary alcohols

D) All of the above

22. The product of the iodoform test is a yellow precipitate of:

A) AgI

B) Cu2O

C) CHI3

D) KI

23. Which type of compounds give a positive iodoform test?

A) Aldehydes with no alpha-hydrogens

B) Ketones with at least one methyl group attached to the carbonyl carbon

C) Primary alcohols

D) Ethers

24. What is the observation in Fehling's test when an aldehyde is present?

A) Formation of a silver mirror

B) Formation of a red precipitate of Cu2O

C) Formation of a yellow precipitate of AgI

D) Decolorization of the reagent

25. Fehling's solution consists of two solutions: A and B. Solution A is:

A) Aqueous solution of K2Cr2O7

B) Aqueous solution of CuSO4

C) Aqueous solution of ammoniacal AgNO3

D) Aqueous solution of NaOH

26. What is the observation in Tollens' test when an aldehyde is present?

A) Formation of a red precipitate

B) Formation of a yellow precipitate

C) Formation of a silver mirror

D) Decolorization of the reagent

27. Tollens' reagent is an alkaline solution of:

A) Silver nitrate

B) Ammoniacal silver nitrate

C) Copper sulfate

D) Potassium permanganate

28. Which test can distinguish between an aldehyde and a ketone?

A) Tollens' test

B) Fehling's test

C) Both Tollens' and Fehling's tests

D) Iodoform test

29. The reaction of phenols with bromine water results in:

A) Monobromophenol

B) Dibromophenol

C) Tribromophenol

D) No reaction

30. Which alcohol reacts fastest with Lucas reagent?

A) Primary alcohol

B) Secondary alcohol

C) Tertiary alcohol

D) All react at the same rate

31. What is the Lucas reagent used for?

A) To distinguish between primary, secondary, and tertiary alcohols

B) To detect the presence of aldehydes

C) To prepare ethers

D) To synthesize carboxylic acids

32. Which reaction is characteristic of aldehydes but not ketones?

A) Nucleophilic addition

B) Oxidation by mild oxidizing agents

C) Reduction by LiAlH4

D) Reaction with Grignard reagents

33. The reaction of an aldehyde or ketone with a Grignard reagent followed by hydrolysis produces:

A) Ether

B) Alkane

C) Alcohol

D) Aldehyde

34. Williamson ether synthesis involves the reaction between:

A) An alcohol and a strong acid

B) An alkoxide and a primary alkyl halide

C) An aldehyde and a Grignard reagent

D) A ketone and a reducing agent

35. Tertiary alcohols cannot be easily oxidized by mild oxidizing agents because:

A) They lack a hydrogen atom on the carbonyl carbon

B) They lack a hydrogen atom on the carbon bearing the hydroxyl group

C) They are highly reactive

D) They are stable compounds

36. What product is formed when a secondary alcohol is oxidized?

A) Aldehyde

B) Carboxylic acid

C) Ketone

D) Ether

37. How are primary alcohols oxidized to aldehydes, and then further to carboxylic acids?

A) Using mild oxidizing agents like PCC

B) Using strong oxidizing agents like KMnO4 or K2Cr2O7

C) Using reducing agents like LiAlH4

D) Using dehydrating agents like concentrated H2SO4

38. Which method is commonly used for the industrial preparation of ethanol?

A) Oxidation of ethene

B) Hydration of ethene

C) Reduction of ethanal

D) Fermentation of sugars

39. What is the IUPAC name for CH3COOH?

A) Formic acid

B) Acetic acid

C) Propanoic acid

D) Butanoic acid

40. Which functional group defines a carboxylic acid?

A) -CHO

B) -CO-

C) -OH

D) -COOH

41. What is the IUPAC name for CH3COCH3?

A) Propanone

B) Butanone

C) Pentanone

D) Hexanone

42. Which functional group is present in a ketone?

A) -CHO

B) -COOH

C) -OH

D) -CO-

43. What is the IUPAC name for CH3CHO?

A) Methanal

B) Ethanal

C) Propanal

D) Butanal

44. Which functional group characterizes an aldehyde?

A) -OH

B) -COOH

C) -CHO

D) -CO-

45. What is the IUPAC name for CH3OCH3?

A) Diethyl ether

B) Dimethyl ether

C) Methyl ethyl ether

D) Propyl methyl ether

46. Which of the following is an ether functional group?

A) R-OH

B) R-CHO

C) R-CO-R'

D) R-O-R'

47. What is the common name for phenol?

A) Carbolic acid

B) Wood alcohol

C) Grain alcohol

D) Antiseptic

48. Which type of alcohol has the hydroxyl group attached to a primary carbon atom?

A) Primary alcohol

B) Secondary alcohol

C) Tertiary alcohol

D) Quaternary alcohol

49. What is the IUPAC name for CH3CH2OH?

A) Methanol

B) Ethanol

C) Propanol

D) Butanol

50. Which functional group defines an alcohol?

A) -COOH

B) -CHO

C) -OH

D) -O-

Alcohols phenols ethers aldehydes ketones carboxylic acids preparation properties reactions and important tests - Question Bank