Organic Chemistry Multiple Choice Questions and Answers

(1) Which of the following reaction is not shown by ketones?

[A] reaction with HCN

[B] reaction with NaHSO₃

[C] reaction with 2,4-Dinitrophenyl hydrazine

[D] reaction with Fehling solution

Answer: reaction with Fehling solution

(2) The enol form of acetone, after treatment with D₂O, gives which of the following product?

[A] (a)

[B] (b)

[C] (c)

[D] (d)

Answer: (b)

(3) Acetone reacts with HCN to form a cyanohydrin. It is an example of which type of reaction?

[A] electrophilic addition

[B] electrophilic substitution

[C] nucleophilic addition

[D] nucleophilic substitution

Answer: nucleophilic addition

(4) Which of the following has most acidic hydrogen?

[A] 3-Hexaone

[B] 2,4- Hexanedione

[C] 2, 3-Hexanedione

[D] 2, 5-Hexanedione

Answer: 2,4- Hexanedione

(5) Which of the following will fail to react with potassium dichromate and dilute sulphuric acid?

[A] Ethyl alcohol (ethanol)

[B] Acetaldehyde (ethanal)

[C] Secondary propyl alcohol (2-propanol)

[D] Acetone (propanone)

Answer: Acetone (propanone)

(6) Which of the following reactions give benzophenone?

[A] 2C₆H₆ + CCl₄ + AlCl₃ + H₂

[B] C₆H₆ + C₆H₅COCl + AlCl₃→

[C] CH₃C₆H₄COC₆H₅ + Heat→t

[D] o−HOOC−C₆H₄−COC₆H₅ + Cu₂60oC→

Answer: C₆H₆ + C₆H₅COCl + AlCl₃→

(7) Which of the following statements regarding chemical properties of acetophenone are wrong?

I. It is reduced to methyl phenyl carbinol by sodium and ethanol

II. It is oxidised to benzoic acid with acidified KMnO4

III. It does not undergo iodoform electrophilic substitution like nitration at meta position

IV. It does not undergo iodoform reaction with iodine and alkali

[A] I and II

[B] II and IV

[C] III and IV

[D] I and III

Answer: III and IV

(8) The product(s) obtained via oxymercuration (HgSO₄+H₂SO₄) of 1-butyne would be what?

[A] CH₃CH₂COCH₃

[B] CH₃CH₂CH₂CHO

[C] CH₃CH₂CHO + HCHO

[D] CH₃CH₂COOH + HCOOH

Answer: CH₃CH₂COCH₃

(9) Benzophenone does not react with which of the following compound?

[A] RNH₂

[B] SO₃

[C] NaOH

[D] Na₂CO₃

Answer: Na₂CO₃

(10) The conversion of acetophenone to acetanilide is best accomplished by using which reaction?

[A] Backmann rearrangement

[B] Curtius rearrangement

[C] Lossen rearrangement

[D] Hofmann rearrangement

Answer: Backmann rearrangement

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

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