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Uses of aldehydes and ketones - class-XII

Description: aldehydes, ketones and carboxylic acids
Number of Questions: 18
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Tags: organic compounds with functional group containing oxygen (part-2) chemistry aldehydes, ketones and carboxylic acids carbonyl compounds organic compounds containing c, h and o
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The percentage of formaldehyde in formalin is:

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. $40$%

  2. $30$%

  3. $20$%

  4. $10$%

Show answer
Correct Option: A
Explanation:
The percentage of formaldehyde in formalin is $40$%
$10$ml formalin contains $40$ ml formaldehyde and $60$ ml of water.

Which of the following is used as a food preservative?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Aldehydes

  2. Ketones

  3. Carboxylic acid

  4. Alcohol

Show answer
Correct Option: C
Explanation:

Carboxylic acid used as food preservatives.

Sodium Benzoate (salt of Benzoic acid) is used as food preservatives.

Which of the following aldehyde is mostly used as plasticizer?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Formaldehyde

  2. Acetaldehyde

  3. Butyraldehyde

  4. Benzaldehyde

Show answer
Correct Option: C
Explanation:

Butyraldehyde is used as an intermediate in the manufacturing of plasticizer.

Hence, option C is correct.

Which is the commercially largest produced aldehyde?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Acetaldehyde

  2. Formaldehyde

  3. Benzaldehyde

  4. Butyraldehyde

Show answer
Correct Option: B
Explanation:

Of all aldehydes, formaldehyde is produced on the largest scale, about 6,000,000 tons per year.

Formalin is:

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. $60$% solution of formaldehyde

  2. $40$% solution of formaldehyde

  3. $30$% solution of formaldehyde

  4. $50$% solution of formaldehyde

Show answer
Correct Option: B
Explanation:
Formalin is the composition of $40$% formaldehyde,
$60$% water. Hence formalin is $40$% formaldehyde.

Which of the following aldehyde is very much used in perfumery and in dye industries?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Formaldehyde

  2. Acetaldehyde

  3. Benzaldehyde

  4. Butyraldehyde

Show answer
Correct Option: C
Explanation:

Benzaldehyde is much used perfumery industries because it has bitter almond odor and also it is used for making aniline dye.

Which of the following does not uses formaldehyde in its preparation?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Melamine polymer

  2. Bakelite

  3. PHBV

  4. preservation of biological specimens

Show answer
Correct Option: C
Explanation:

Formaldehyde is not used in the preparation of PHBV. PHBV is a thermoplastic polymer. The monomers, 3-hydroxybutanoic acid and 3-hydroxypentanoic acid, are joined by ester bonds; the back bone of the polymer is made up of carbon and oxygen atoms.

A major constituent of vinegar is:

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Methanoic acic

  2. Benzoic acid

  3. Ethanoic acid

  4. Picric acid

Show answer
Correct Option: C
Explanation:

The main constituent of vinegar is acetic acid. The other constituents will depend on the nature of the raw material that has undergone fermentation.

Hence, option $C$ is correct.

Which of the following doesn't use acetaldehyde as a starting material in its preparation?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Ethyl acetate

  2. Ethanoic acid

  3. Methanoic acid

  4. Drugs

Show answer
Correct Option: C
Explanation:
Methanoic acid needs only single carbon compound  not acetaldehyde.
$HCOOH$-formic acid/Methanoic acid.

Which of the following is used for preserving biological specimens?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Formaldehyde

  2. Ether

  3. Ethyl alcohol

  4. None of these

Show answer
Correct Option: A
Explanation:

Formaldehyde ($HCHO$) in the form of formalin (40% solution of formaldehyde) is used for preserving biological specimens.

Formaldehyde is used :

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. for preserving biological specimens

  2. for the preparation of urotropine

  3. in the manufacture of bakelite

  4. all of these

Show answer
Correct Option: D
Explanation:

Formaldehyde is used for preserving specimens for the preparation of Urotropine and in manufacture of Bakelite.

Benzaldehyde is used:

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. as a flavouring agent for food

  2. in the manufacture of triphenylmethane dyes like malachite green

  3. as a starting material for the preparation of cinnamic acid

  4. all of these

Show answer
Correct Option: D
Explanation:

Benzaldehyde is used as flavoring agent, manufacture of dyes like triphenylmethane dyes and also as starting material for the preparation of cinnamic acid.

Which of the following statement is true?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Benzaldehyde is used in perfumery industry

  2. Formaldehyde is used for silvering mirrors

  3. Acetone is used as a commercial solvent

  4. All of the above

Show answer
Correct Option: D
Explanation:
A. Benzaldehyde is used in perfumery
B. Formaldehyde is used for silvering mirrors because of its aldehydic group.
C. Acetone is used as a commercial solvent for the various organic compound.

Formalin is _______ % solution of formaldehyde in water

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. 10

  2. 20

  3. 40

  4. 60

Show answer
Correct Option: C
Explanation:
Formalin is $40$% solution of formaldehyde in water.
Formalin means $40$% formaldehyde.

Which of the following is the flavouring agent for food, beverages etc?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Acetone

  2. Formaldehyde

  3. Benzaldehyde

  4. Phenol

Show answer
Correct Option: C
Explanation:
Benzaldehyde is used as flavoring, perfumery and in dye industries.
So, benzaldehyde is flavoring agent for food and beverages.

Which of the following can be used as a solvent for cellulose acetate, cellulose nitrate, and celluloide?

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. Formaldehyde

  2. Acetaldehyde

  3. Acetic acid

  4. Acetone

Show answer
Correct Option: D
Explanation:
Acetone is most used industrial solvent, for many synthetic fibers. It is good solvent for synthetic fibres as it is denaturant and it reduces explosive reactions.

Acetone is used:

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. for extraction of essential oils

  2. as a constituent of liquid nail polish

  3. both A and B

  4. none of these

Show answer
Correct Option: C
Explanation:

Acetone is used for extraction of essential oils and a constituent of liquid nail polish. Also. It is used in perfumes as it causes aroma.

Butyraldehyde are produced commercially by:

chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

  1. hydroformylation

  2. hydroacetylation

  3. formylation

  4. acetylation

Show answer
Correct Option: A
Explanation:
Hydroformylation is an industrial process for the formation aldehydes from Alkenes also called as oxo-synthesis
Butyraldehyde also produced commercially from Hydroformylation.
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