MCQs on Aldehydes, Ketones and Carboxylic Acids

MCQs on Aldehydes, Ketones and Carboxylic Acids

1. A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives

1. benzyl alcohol + sodium formate
2. sodium benzoate + methanol
3. benzyl alcohol + methanol
4. sodium benzoate + sodium formate

Answer: (1)

2. Which of the following has the most acidic hydrogen?

1. hexane-2,4-dione
2. hexane-2,3-dione
3. hexane-2,5-dione
4. hexane-3-one

Answer: (1)

3. A new C-C bond formation is possible in

1. cannizzaro reaction
2. friedel crafts reaction
3. clemmensen reduction
4. reimer tiemann reaction

Answer: (2,4)

4. Under Wolff-Kishner reduction conditions, the conversions which may be brought about are

1. cyclohexanone into cyclohexane
2. benzaldehyde into benzyl alcohol
3. cyclohexanone into cyclohexanol
4. benzophenone into diphenylmethane

Answer: (1,4)

5. The formation of cyanohydrin from a ketone is an example of

1. electrophilic addition
2. nucleophilic addition
3. nucleophilic substitution
4. electrophilic substitution

Answer: (2)

6. Benzoic acid reacts with conc.HNO₃ and conc.H₂SO₄ to give

1. o-nitrobenzoic acid
2. p-nitrobenzoic acid
3. m-nitrobenzoic acid
4. o,p-dinitrobenzoic acid

Answer: (3)

7. An inorganic compound producing an organic compound on heating is

1. ammonium cyanate
2. soda lime
3. sodamide
4. potassium cyanide

Answer: (1)

8. The reaction of ethyl formate with an excess of CH₃MgI followed by hydrolysis gives

1. ethanol
2. n-propyl alcohol
3. propanal
4. isopropyl alcohol

Answer: (4)

9. Formic acid and acetic acid are distinguished by reaction with

1. sodium ethoxide
2. sodium
3. HgCl₂
4. 2,4-dinitrophenylhydrazine

Answer: (3)

10. Heating a mixture of sodium benzoate and soda lime gives

1. calcium benzoate
2. benzene
3. sodium benzoate
4. methane

Answer: (2)