Organic Chemistry Questions and Answers – Chemical Properties of Aldehydes | Organic Chemistry Multiple Choice Questions and Answers

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Questions
1 During a reaction of Tollens test, the formation of mirror inside the tube is due to which of the following?
A silver ions
B silver atoms
C silver compounds
D silver nitrate

Answer:silver atoms
2 Reduction of Aldehydes to hydrocarbon take place in the presence of which of the following?
A Zn amalgam and HCl acid
B Pd/BaSO4
C Anhydrous AlCl3
D Ni/Pt

Answer: Zn amalgam and HCl acid
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3 For C6H5CHO which of the following is incorrect?
A On oxidation it yields benzoic acid
B It is used in perfumery
C It is an aromatic aldehyde
D On reduction yields phenol

Answer: On reduction yields phenol
4 Which of the following compound will undergo self-aldol condensation in the presence of cold dilute alkali?
A C6H5CHO
B CH3CH2CHO
C CH≡C−CHO
D CH2=CH−CHO

Answer: CH3CH2CHO
5 Which of the following will not undergo aldol condensation?
A Acetaldehyde
B Propanaldehyde
C Benzaldehyde
D Trideuteroacetaldehyde

Answer: Benzaldehyde
6 Acetaldehyde cannot show which of the following test?
A Iodoform test
B Lucas test
C Benedict’s test
D Tollen’s test

Answer:Lucas test
7 What will be the product if aldehyde reacts with NaOH?
A Benzyl alcohol
B Benzoic alcohol
C Hydrobenzamide
D Cinnamic acid

Answer: Benzyl alcohol
8 To distinguish between formaldehyde and acetaldehyde, we require which of the following reagent?
A Tollen’s reagent
B Fehling’s solution
C Schiff’s reagent
D Caustic soda solution

Answer: Caustic soda solution
9 If formaldehyde and KOH are heated, then we get which of the following compound?
A Acetylene
B Methane
C Methyl alcohol
D Ethyl formate

Answer: Methyl alcohol
10 Acetaldehyde reacts with C2MH5MgCl the final product is which of the following?
A An aldehyde
B A ketone
C A primary alcohol
D A secondary alcohol

Answer: A secondary alcohol
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