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

Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(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
(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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