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Organic Chemistry Questions and Answers – Preparation of Benzaldehyde & Aromatic Ketones | Organic Chemistry Multiple Choice Questions and Answers

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(1) The oxidation of toluene to benzaldehyde by chromyl chloride is called as which of the following?
[A] Cannizzaro reaction
[B] Wurtz reaction
[C] Etard reaction
[D] Reimer-Tiemann reaction
Answer: Etard reaction
(2) Benzaldehyde can be prepared by oxidation of toluene by which of the following reagent?
[A] Acidic KMnO4
[B] K2Cr2O7
[C] CrO2Cl2
[D] basic KMnO4
Answer: CrO2Cl2
(3) The oxidation of benzyl chloride with lead nitrate gives which of the following compound?
[A] Benzaldehyde
[B] Benzyl alcohol
[C] Benzoic acid
[D] p-chlorobenzaldehyde
Answer: Benzaldehyde
(4) Which of the following is the commercial method of preparation of benzaldehyde?
[A] Oxidation of toluene
[B] Oxidation of benzyl chloride
[C] Oxidation of benzyl alcohol
[D] Etard reaction
Answer: Oxidation of benzyl alcohol
(5) Which of the following is the not a method of preparation of benzaldehyde?
[A] Gattermann Koch synthesis
[B] Etards reaction
[C] Stephan’s reaction
[D] Oxidation of secondary alcohol
Answer: Oxidation of secondary alcohol
(6) What reagents will be used in the preparation of benzaldehyde via Gattermann Koch synthesis?
[A] Carbon dioxide and HCl
[B] Carbon monoxide and HCl
[C] Oxygen and H2SO4
[D] Carbon monoxide and H2SO4
Answer: Carbon monoxide and HCl
(7) Partial reduction of phenyl cyanide with stannous chloride and passing dry HCl gas in ether solution followed by hydrolysis of the aldimine stannic chloride with water to form benzaldehyde is called as which of the following method of preparation of benzaldehyde?
[A] Gattermann Koch synthesis
[B] Etards reaction
[C] Stephan’s reaction
[D] Gattermann reaction
Answer: Stephan’s reaction
(8) Ozonolysis of styrene will lead leads to formation of benzaldehyde along which compound?
[A] O2
[B] H2O2
[C] HCHO
[D] H2O2 and HCHO
Answer: HCHO
(9) Which of the following cannot be used in formation of benzaldehyde by Grignard reagent?
[A] HCN
[B] Carbon monoxide
[C] Ethyl format
[D] HNC
Answer: Ethyl format
(10) What is the laboratory method for the formation of benzaldehyde?
[A] Gattermann Koch synthesis
[B] Etards reaction
[C] Stephan’s reaction
[D] Oxidation of benzyl chloride
Answer: Oxidation of benzyl chloride
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