Chemistry · Science General

Alcohols, Ethers and Carboxylic Acids

359 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

Which of the following statements is correct about isochlorogenic acid?

  1. Isochlorogenic is an important intermediate in lignin biosynthesis.

  2. Isochlorogenic acid also gives the laxative effect.

  3. It gives caffice acid and (-)-quinic acid.

  4. It can be found in coffee.

  5. Both (2) and (3)

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

This option is correct because the isomer containing two caffice acid molecules is called the isochlorogenic acid. It can be found in coffee.

Multiple choice

CH3CH2CH2OH is

  1. Ethanol

  2. Propanol

  3. Butanol

  4. Butanoic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

CH3CH2CH2OH is the molecular formula for propanol. Counting the carbon atoms in the chain: there are 3 carbons (the parent chain is propane), and the -OH group indicates it is an alcohol (propanol). Ethanol has 2 carbons, butanol has 4, and butanoic acid is a carboxylic acid with 4 carbons.

Multiple choice

X compound reacts with methyl alcohol in presence of acid to give Y compound. Y compound gives sweet-smelling and used in making perfumes and as flavouring agents. What is X and Y?

  1. X = CH3CH2OH, Y = CH3COOH

  2. X = CH3COOH, Y = CH3COCH3

  3. X = CH3OCH3, Y = CH3COOH

  4. X = CH3COOH, Y = CH3COOCH3

  5. X = CH3COOH, Y = CH3COOCH2CH3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Action of carboxylic acids with alcohols in presence of acids to give ester, this reaction is known as esterification. Esters are sweet-smelling substances. These are used in making perfumes and as flavouring agents. Esters react in the presence of an acid or a base to give back the alcohol and carboxylic acid. CH3COOH + CH3OH □(→┴Acid ) CH3COOCH3.

Multiple choice

Ethanol reacts with sodium to form which of the following two products?

  1. Sodium ethanoate and hydrogen gas

  2. Sodium ethoxide and hydrogen gas

  3. Sodium ethanoate and oxygen gas

  4. Sodium hydrogen carbonate and carbon dioxide gas

  5. Sodium ethoxide and oxygen gas
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ethanoic acid reacts with a base, such as sodium hydroxide to give a salt (sodium ethanoate or commonly called sodium acetate) and water: 2Na + 2CH3CH2OH → 2CH3CH2ONa + H2

Multiple choice

Ethylalcohol is treated with alkaline potassium permanganate to give a carboxylic acid. This conversion of reaction is example of

  1. combustion reaction

  2. addition reaction

  3. substitution reaction

  4. oxidation reaction

  5. hydrogenation

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

Alkaline potassium permanganate or acidified potassium dichromate are oxidising alcohols to acids, i.e., adding oxygen to the starting material. Hence, they are known as oxidising agents.

Multiple choice

An organic compound X is an essential constituent of wine /beer and intoxication causes by drinks. Oxidation of X yields an organic compound Y, which is present in vinegar. What is X and Y?

  1. X = CH3CH2OH, Y = CH3COOH

  2. X = CH3OH, Y = CH3COOH

  3. X = CH4, Y = CH3OH

  4. X = CH3CHO, Y = CH3COOH

  5. X = CH3COOH, Y = CH3COOH
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Compound ( X) CH3CH2OH is ethanol,  which essential constituent of beer and wine. It causes intoxication. Oxidation of ethanol (CH3CH2OH) yields ethanoic acids. Vinegar is 5-8% solution of ethanoic acid (acetic acid) in water. CH3CH2OH □(→┴(Oxidation ) ) CH3COOH

Multiple choice

Which of the following compounds is an ester?

  1. CH3COOH

  2. CH3COCH3

  3. CH3COOCH3

  4. CH3CHO

  5. C2H5CHO
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Methyl ethanoate, i.e. CH3COO (CH3COOH) comes from ethanoic acid and CH3 comes from methanol (CH3OH). Methyl ethanoate is an ester.

Multiple choice

Which of the following options belong to tertiary alcohol?

  1. CH3-OH

  2. CH3CH2CH2CH2OH

  3. CH3C(CH3)(OH)CH3

  4. CH3CH(OH)CH2CH3

  5. CH3CH1CH1OH
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In tertiary alcohol, such as CH3C(CH3)(OH)CH3 (2-methylpropan-2-ol), the alcohol functional group is in the 'middle' of the chain, with three alkyl groups attached to the same carbon as the alcohol functional group.

Multiple choice

Consider the following facts:

  1. Bioethanol is an alcohol made by fermentation, mostly from carbohydrates produced in sugar or starch crops such as corn or sugarcane.
  2. Ethanol can be used as a fuel for vehicles as an additive to gasoline and not in its pure form.

Which of the above statements is/are true?

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ethanol can be used as a fuel for vehicles in its pure form, but it is usually used as a gasoline additive to increase octane and improve vehicle emissions. Bioethanol is widely used in USA and in Brazil.

Multiple choice

Which of the following mixtures will show negative deviation from Raoult’s law?

  1. Acetone and formaldehyde

  2. Acetone and ethyl alcohol

  3. Acetaldehyde and formaldehyde

  4. Methane and acetaldehyde

  5. Methane and ethyl alcohol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct answer. As bonding between two components (acetone and ethyl alcohol) is more than individuals due to H-bonding, this mixture will show negative deviation from Raoult’s law.