MCQs on Aldehydes Ketones and Carboxylic Acids

Aldehydes, ketones, carboxylic acids, and their derivatives are examples of organic compounds with carbonyl groups. The carbonyl carbon in formaldehyde, the most basic aldehyde, is linked to two hydrogen atoms. The carbonyl carbon is linked to a hydrogen atom and an alkyl group in all other aldehydes. A ketone’s carbonyl carbon is linked to two alkyl groups. The oxidation of primary alcohols or aldehydes produces carboxylic acids. They’re also made from nitriles, acid chlorides, esters, anhydrides, and amides after they’ve been hydrolyzed.

Aldehydes, ketones, and carboxylic acids are carbonyl compounds with a double bond between carbon and oxygen. The carbonyl group has a sp2 hybridization of carbon and oxygen, and the carbonyl double bond has one -bond and one -bond. Above and below the plane, the electron cloud can be found. Carbonyl carbon and oxygen are sandwiched between the cloud and the atmosphere. Because oxygen has a higher electronegativity than carbon, the carbonyl group is dipole-shaped.

Aldehydes = Aldehydes have one hydrogen atom, one alkyl or aryl group, and one carbonyl group connected to them.

Ketones are organic compounds in which the carbonyl group is linked to two alkyl groups, aryl groups, or both alkyl and aryl groups, or both alkyl and aryl groups.

Carboxylic Acid = Carboxylic acid is a class of organic compounds in which the carbon (C) atom is double bonded to the oxygen (O) atom and the hydroxyl group (OH) is single bonded. A fourth bond connects carbon atoms to hydrogen (H) atoms or another sort of univalent group. Carbonyl (C=O) and hydroxyl groups make up a carboxyl (COOH) group. Aldehydes = Aldehydes have one hydrogen atom, one alkyl or aryl group, and one carbonyl group connected to them.

1. When benzaldehyde and formaldehyde are heated in an aqueous NaOH solution, they produce

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

The answer is: (1)

2. Which of the following hydrogens is the most acidic?

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

The answer is: (1)

3. The development of a new C-C bond is conceivable in

1. reaction of Cannizzaro
2. Friedel is a response artist.
3. reduction by Clemmensen
4. response of Reimer and Tiemann

The answer is: (2,4)

4. The conversions that can be made under Wolff-Kishner reduction circumstances include

1. cyclohexanone to cyclohexane conversion
2. benzaldehyde to benzyl alcohol transformation
3. cyclohexanone to cyclohexanol conversion
4. diphenylmethane from benzophenone

The answer is: (1,4)

5. One example of this is the production of cyanohydrin from a ketone.

1. addition of electrophilic
2. inclusion of nucleophiles
3. Replacement of nucleophiles
4. Replacement of electrophiles

The answer is: (2)

6. Conc.HNO3 and conc.H2SO4 react with benzoic acid to form

1. o-nitrobenzoic acid is a kind of nitrobenzoic acid.
2. p-nitrobenzoic acid is a kind of nitrobenzoic acid.
3. m-nitrobenzoic acid is a kind of nitrobenzoic acid.
4. o,p-dinitrobenzoic acid is a kind of o,p-dinitrobenzoic acid.

The answer is: (3)

7. When an inorganic chemical is heated, it produces an organic compound.

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

The answer is: (1)

8. Ethyl formate reacts with an excess of CH3MgI and then hydrolyzes to produce

1. ethanol
2. n-propyl alcohol is a kind of alcohol.
3. propanal
4. isopropyl alcohol is a kind of alcohol.

The answer is: (4)

9. The reaction between formic acid and acetic acid distinguishes them.

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

The answer is: (3)

10. When a mixture of sodium benzoate and soda lime is heated, it produces

1. benzoate of calcium
2. benzene
3. sodium benzoate (sodium benzoate)
4. methane

The answer is: (2)

11. What is the common name of the molecule with a CHO group connected to a benzene ring’s sp2 hybridized carbon?

1. Benzaldehyde 
2. b) Both a and d
3. c) None of these 
4. Phthalaldehyde 

The answer is Benzaldehyde.

12. Determine the IUPAC name for CH3-CH=CH-CHO.

1. But-2-enal 
2. Ethane
3. But-2-en
4. Buten-2-al

The answer is But-2-enal.

13. ________ is another name for the chemical 3-Phenylprop-2-enal.

1. Crotonaldehyde 
2. Cinnamaldehyde 
3. Salicylaldehyde (Salicylaldehyde)
4. vanillin 

The answer is Cinnamaldehyde.

14. What is the number of aldehydic groups in the chemical phthalaldehyde?

1. 1
2. 2
3. 3
4. 4

The answer is 2nd.

15. Which of the following compounds doesn’t have a carbonyl group in it?

1. Alcoholic beverages
2. Aldehyde is a kind of aldehyde.
3. the ketones
4. Carboxylic acid 

The answer is Alcohol.

16. What is the number of carbon atoms in formaldehyde?

1. Null
2. 1
3. two
4. three

The answer is 1st.

17. What is butanal’s common name?

1. n-Butyraldehyde
2. Butanaldehyde
3. Butyraldehyde (n-Butyraldehyde)
4. None of these

The answer is n-Butyraldehyde.

19. Which of the following ketones has the common term acetone?

1. Dimethyl ketone 
2. Ethyl methyl ketone 
3. Diethyl ketone 
4. N-propyl ketone 

The answer is Dimethyl ketone.

20. When all of the following are present in a compound, which one will be the major group?

1. CHOICE
2. -CO -CO -CO -CO -CO
3. CHO-
4. -Cl –

The answer is -CHO.

21. ________ ketones are named by prefixing the word phenone with the name of the acyl group.

1. Methyl ethyl
2. Dialkyl
3. Alkyl phenyl
4. Phenyl alkyl
5. diphenyl diphenyl diphenyl diphenyl diphenyl di

The answer is Alkyl phenyl.

22. What does CH3-CO-CH2-CH2-CH3’s name stand for?

1. Butan-1-one
2. Butan-2-one 
3. Pentan-1-one
4. Pentan-2-one

The answer is Pentan-2-one.

23. What is -Methylcyclohexanone’s correct IUPAC name?

1. Methylcyclohexanone 
2. Methylcyclohexan-2-one (Methylcyclohexan-2-one)
3. 2-Methylcyclohexanone 
4. d) Cyclo Methyl Hexan-2-one

The answer is 2-Methylcyclohexanone.

24. What is diisopropyl ketone’s IUPAC name?

1. Diisopropylpropan-2-one (1,3-Isopropyl Propan-2-one
2. Dimethylpentan-3-one (2,4-Dimethylpentan-3-one)
3. 2-Methyl-1-(1-methylethyl) propan-1-one (c)
4. Dimethylpropan-2-one (1,3-Dimethylpropan-2-one)

The answer is 2,4-Dimethylpentan-3-one.

25. What is the angle between the carbonyl C-O bond and the bond between the carbonyl carbon and the atom connected to it?

1. 60 degrees
2. 90 degrees
3. 120 degrees
4. 135 degrees

The answer is 120°.