ECAT Pre Engineering Chemistry Chapter 23 MCQ Test With Answer

Distillation of calcium salts of acetic acid and formic acids gives acetaldehyde. What compound would be obtained if only calcium salt of acetic acid is distilled

• Formaldehyde A
• Butyraldehyde B
• Propionaldehyde C
• Acetone D

The addition of HCN to carbonyl compounds is an example of

• Nucleopihlic substituion A
• Electrophilic addition B
• Nueleophilic addition C
• Electrophilic substitution D

Cannizzzaro's reaction is not given by:

• Formaldehyde A
• Acetaldehyde B
• Benzaldehyde C
• Trimethyl D

For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test

• HCHO and CH₃CHO A
• CH₃CHO and CH₃COCH B
• CH₃COCH₃and C₆H₅COCH₃ C
• CH₃COOH and CH₃COOCH₃ D

Ketons are prepared by the oxidation of

• Primary alcohol A
• Secondary alcohol B
• Tertiary alcohol C
• None of these D

Benzophenone can be converted into benzene using

• Fused alkali A
• Anhydrous AlCl₃ B
• Sodium amalgam in water C
• Acidfied dichromate D

In Tolten's best, the end product is ______ formed

• White ppts A
• Red ppts B
• Yellow ppts C
• Silver mirror D

Aldehyde and small methyl ketones form crystalline ______ ppts with saturated sodium bisulphate solution

• White A
• Red B
• Yellow C
• None of these D

In aldol condensation reaction, a double bond is formed between ______ and ______ carbon atoms

• αandβ A
• αandα B
• αand Y C
• None of these D

• Br_2(aq) A
• 2, 4-dinitrophenylhydrazine B
• NaBH C
• Tollen's reagent D

Which reaction is of condensation or addition elimination reaction?

• Ketol A
• Aldol B
• Cannizzaro C
• All of these D

From which of the following tertiary butyl alcohol is obtained by the action of methyl magnesium iodide?

• HCHO A
• CH₃CHO B
• CH₃COCH₃ C
• CO₂ D

A compound R has all of the following properties. It is neutral; It gives an orange precipitate with 2,4-dinitrophenythydrazine; it evolves hydrogen chloride when treated with PCI₅in the cold What could R be

• 
  A
• 
  B
• 
  C
• 
  D

Formalin is an aqueous solution of

• Furfural A
• Fluorescein B
• Formaldehyde C
• Formic acid D

Which of the following react with NaOH to produce an acid and an alcohol?

• NCHO A
• CH₃COOH B
• CH₃CH₂COOH C
• C₆H₅COOH D

Which of the following will have the highest boiling point?

• Methanal A
• Ethanal B
• Propanal C
• 2-Hexanone D

The homologous series of aldehydes and ketones have general formula:

• C_nH_2nO A
• C_nH_nO B
• C_nH_2n-1O C
• C_nH_nO_n D

An organic compound has the following properties ; It gives a positive tri-iodomethane test; it gives a yellow ppt, with 2, 4-DNP regent; it does not react with Tollen's reagent . Which compound would give these results

• CH₃CHO A
• CH₃CH₂OH B
• CH₃CH₂COCH₃ C
• CH₃CH₂CH₂CHO D

The color of ppts formed by Benedirct's test is

• Brick red A
• Wine red B
• Yellow C
• Orange D

The color of ppts formed by Fehling's test is

• Brick red A
• Red B
• Yellow C
• Orange D

Which of the following does not react with phenyl hydrazine?

• Ethanol A
• Ethanal B
• Acetone C
• Acetophenone D

Acetone is oxidized with

• Tollen's reagent A
• Fehling solution B
• Acidic dichromate solution C
• Benedicts solution D

Reduction of aldehydes with HI and P gives

• Primary alcohols A
• Secondary alcohols B
• Alkanes C
• Tertiary alcohols D

Which reaction yields Bakelite?

• Urea with HCHO A
• Tetramethyl glycol with Hezamethylene diisocyanate B
• Phenol and HCHO C
• Ethylene glycol and Dimethylterephthalate D

• With H₂/Ni CH₃(CH₂)₅CH₂OH A
• With H₂/Ni CH₃(CH₂)₅CH₃ B
• With NaBH₄ CH₃(CH₂)₅CH₂OH C
• With NaBH₄ CH₃(CH₂)₅CHO D

Which is not true about acetophenone?

• Reacts to form 2,4-dintrophenyl hydrazine A
• Reacts with Tollen's reagent to form silver mirror B
• Reacts with I₂/NaOH to form iodoform C
• On oxidation with alkaline KMnO₄followed by hydrolysis gives benzoic acid D

Which of the following is halo form

• CHBr₃ A
• CHCI₃ B
• CHI₃ C
• All of these D

Which of the following is a method of converting a unsaturated ketone into unsaturated hydrocarbon?

• Aldol condensation A
• Reimer Tiemann reaction B
• Cannizaaor's reaction C
• Wolf-kishner reduction D

Chromyl chloride and toluene react to produce

• p-chlorotoluene A
• Benzaldehyde B
• Benzyl chloride C
• Bezoic acid D

The carbon atom of a carbonyl group is

• Sp hybridized A
• Sp²hybridized B
• Sp³hybridized C
• None of these D