Chemistry · Science General

Alcohols, Ethers and Carboxylic Acids

391 Questions

Alcohols, ethers, and carboxylic acids questions explore organic chemistry reactions, chemical formulas, and compound identifications. The topics cover practical applications like antifreeze production and specific chemical conversions. This material helps candidates preparing for science oriented competitive exams.

Organic reactionsChemical compounds identificationAlcohol conversionCarboxylic acid propertiesIndustrial chemical applications

Alcohols, Ethers and Carboxylic Acids Questions

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

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

  1. Formaldehyde

  2. Acetaldehyde

  3. Benzaldehyde

  4. Butyraldehyde
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Benzaldehyde is much used perfumery industries because it has bitter almond odor and also it is used for making aniline dye.
Multiple choice chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

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

  1. Ethyl acetate

  2. Ethanoic acid

  3. Methanoic acid

  4. Drugs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Methanoic acid needs only single carbon compound  not acetaldehyde.
$HCOOH$-formic acid/Methanoic acid.
Multiple choice chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

Benzaldehyde is used:

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

Which of the following statement is true?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

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

  1. Formaldehyde

  2. Acetaldehyde

  3. Acetic acid

  4. Acetone
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice chemistry aldehydes, ketones and carboxylic acids uses of aldehydes and ketones organic compounds with functional group containing oxygen (part-2) carbonyl compounds

Acetone is used:

  1. for extraction of essential oils

  2. as a constituent of liquid nail polish

  3. both A and B

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Butyraldehyde are produced commercially by:

  1. hydroformylation

  2. hydroacetylation

  3. formylation

  4. acetylation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Hydroformylation is an industrial process for the formation aldehydes from Alkenes also called as oxo-synthesis
Butyraldehyde also produced commercially from Hydroformylation.
Multiple choice chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

Which of the following is not a characteristic of alcohol ?

  1. They are lighter than water.

  2. Their boiling points rise fairly uniformly with rising molecular weight.

  3. Lower members are insoluble in water and organic solvents but the solubility regularly increases with molecular mass.

  4. Lower members have a pleasant smell and burning taste, higher members are colourless and tasteless.

  5. Higher members have a pleasant smell and burning taste, lower members are colourless and tasteless.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Alcohols are lighter than water because water molecules are closely packed together due to extensive H-bonding, which means that it has more mass in the same volume than either alcohol or oil. In addition, alcohol is made up of carbon and hydrogen atoms while water is made up of oxygen and hydrogen atoms.
B. Their boiling points rise fairly uniformly with rising molecular weight this is because boiling point depends on the intermolecular interactions such as H-bonding which decreases as the chain length decreases.
C. Lower members are soluble in water and organic solvents but the solubility regularly decreases with molecular mass because of ease of H-bonding in smaller alcohol molecules than those having long hydrocarbon chain.
D. Lower members have a pleasant smell and burning taste, higher members are colourless and tasteless.
Multiple choice chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

Which of the following has a higher boiling point?

  1. Butanol

  2. Butanal

  3. Both of them have similar boiling point

  4. Cannot say anything

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There is a large difference between boiling points of butanol and butanal, although they have almost the same solubility in water. Butanol contains -OH group and can form hydrogen bonds. Hence, the molecules are associated. A large amount of energy is required to break the association. Hence, butanol has a higher boiling point. Hydrogen bonding is not possible in butanal.

Multiple choice preparation of haloalkanes halogen derivatives carbon tetrachloride ddt

For the preparation of chloroethane,

  1. $HCl$ gas is passed through ethanol.

  2. ethanol is treated with thionyl chloride in the presence of dimethyl amine or pyridine.

  3. ethyl sulphide is treated with hydrogen chloride.

  4. any of the above methods can be employed.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

${C} _{2}{H} _{5}OH\xrightarrow [  ]{ SO{ Cl } _{ 2 } }  {C} _{2}{H} _{5}Cl+{SO} _{2}+HCl$
(a). $HCl$ bond is strong, no reaction.

Multiple choice preparation of haloalkanes halogen derivatives carbon tetrachloride ddt

By the action of $PCl _3$ or $PCl _5$ with alcohols alkyl halides and a by product $HCl$ is formed.The byproduct HCl is absorbed by using :

  1. $Et _3N,C _5H _5N$
  2. $Et _2NH,C _5H _5N$
  3. $Et _NH _2,C _5H _5N$
  4. $Et _3N,C _6H _5N$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

By the action of $PCl _3$ or $PCl _5$ with alcohols alkyl halides and a
by product $HCl$ is formed.The byproduct $HCl$ is absorbed by using Triethyl amine($Et _3N$),pyridine($C _5H _5N$) which are bases and neutralise the acid like $HCl$ and $HBr$ etc.

Multiple choice preparation of haloalkanes halogen derivatives carbon tetrachloride ddt

Trimethyl amine used for _______ in  the preparation of alkyl halide from alchohol and phosphorous halide.

  1. the absorption of hydrogen halide

  2. the release of Hydrogen halide

  3. as the catalyst

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Trimethyl amine and pyridine used for the absorption of hydrogen halide.in  the preparation of alkyl halide from alchohol and phosphorous halide.As these two are bases which can neutralize the acids like $HCl$ and $HBr$
Hence option A is correct.

Multiple choice preparation of haloalkanes halogen derivatives carbon tetrachloride ddt

Bases like tri-ethyl amine and pyridine are used to:

  1. mop up the acidic byproduct

  2. crystallize alkyl halide

  3. evaporate alkyl halide

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bases like tri-methyl amine and pyridine are used to mop up the acidic byproduct and make it neutral.
Hence option A is correct.

Multiple choice preparation of haloalkanes halogen derivatives carbon tetrachloride ddt

Alkyl bromide is prepared by heating alcohol with ______ phosphorus in the presence of bromine gas.

  1. black

  2. white

  3. red

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Alkyl Bromide is prepared by heating alcohol with Red phosphorous in the presence of Bromine gas.

$CH _3-OH \xrightarrow{Red\ P/Br _2} CH _3-Br$