Free Reactivity of Carboxylic Acids MCQs with Answers
56 Reactivity of Carboxylic Acids MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Carboxylic acids show acidic behaviour because their carboxylate ions are resonance-stabilised, and electron-withdrawing groups can change their strength. Reactions include neutralisation, esterification, formation of acid chlorides and amides, reduction, decarboxylation and substitution at the acyl carbon, which differs from the reactions of phenols.
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- A. CCl3COOH<CHCl2COOH<CH2ClCOOH<CH3COOH
- B. CHCl2COOH<CH2ClCOOH<CH3COOH<CCl3COOH
- C. CH2ClCOOH<CH3COOH<CCl3COOH<CHCl2COOH
- D. CH3COOH<CH2ClCOOH<CHCl2COOH<CCl3COOH
Explanation: The acidity of carboxylic acids is influenced by the presence of electron-withdrawing groups, such as chlorine atoms.
Correct answer: CH3COOH<CH2ClCOOH<CHCl2COOH<CCl3COOH- A. Acetic acid
- B. Ascorbic acid
- C. Butyric acid
- D. Picric acid
Explanation: Picric acid (2,4,6-trinitrophenol) does not have a COOH group. Instead, it has a phenol group (-OH) with three nitro groups (-NO2)…
Correct answer: Picric acid- A. Tollen's test
- B. Fehling's test
- C. Iodoform test
- D. Sodium bicarbonate test
Explanation: The sodium bicarbonate test is the correct option. It is a chemical test used to distinguish between benzoic acid and ethyl benzoate.
Correct answer: Sodium bicarbonate test- A. H2/Ni
- B. Pd/C
- C. HI/P
- D. LiAlH4
Explanation: "HI" reduces carboxylic acid to alkanes in the presence of "P" as a catalyst as it is a strong reducing agent.
Correct answer: HI/P- A. Formic acid & acetic acid
- B. Acetic acid & acetic acid
- C. Acetone & formic acid
- D. Acetic acid & acetone
Explanation: Formic acid contains both a carboxyl group and an aldehyde group, which allows it to react with Na2CO3 to produce effervescence and with…
Correct answer: Formic acid & acetic acid- A. Water, Alcohol, Ether
- B. HCl, HBr, HI
- C. Bromine water
- D. All of these options are correct
Explanation: Option A: Acetic acid is infinitely miscible in water, alcohol, glycerol, ether, and carbon tetrachloride.
Correct answer: Water, Alcohol, Ether27. Which of the following compounds has the empirical formula, (CH2O) and reacts with sodium hydroxide?
- A. Carbonic acid
- B. Ethanol
- C. Acetic acid
- D. Methanoic acid
Explanation: Acetic acid (CH3COOH) has the empirical formula CH2O, as the molecular formula can be simplified to CH2O by dividing each subscript by the…
Correct answer: Acetic acid- A. Chloroethanoic acid
- B. Ethanoic acid
- C. Ethylamine
- D. Phenol
Explanation: The lowest pH corresponds to the strongest acid. Chloroethanoic acid is a stronger acid than ethanoic acid and phenol due to the…
Correct answer: Chloroethanoic acid- A. Catalyst
- B. Formation of ester
- C. Formation of salt
- D. Formation of water
Explanation: When a carboxylic acid is reacted with a base, such as sodium hydroxide, it undergoes neutralization to form salt and water.
Correct answer: Formation of water- A. Propanoic acid
- B. Ethanoic acid
- C. Chloro-ethanoic acid
- D. 2-Methyl Propanoic acid
Explanation: Carboxylic acids are most acidic organic compounds. Resonance stabilization of carboxylate ion allows the negative charge to be…
Correct answer: Chloro-ethanoic acid- A. CO2
- B. H2
- C. CO
- D. CH4
Explanation: Carboxylic acids react with metals, such as sodium or magnesium, to form salts (carboxylates) and hydrogen gas.
Correct answer: H2- A. Ethanoic acid
- B. Propanoic acid
- C. Butanoic acid
- D. Pentanoic acid
Explanation: Ethanoic acid is called glacial acetic acid having melting point of 17 degrees
Correct answer: Ethanoic acid- A. Dipole dipole forces
- B. London dispersion forces
- C. Hydrogen bonding
- D. Covalent bonding
Explanation: Hydrogen bonds are formed between the individual molecules of the acid and water molecules.
Correct answer: Hydrogen bonding- A. Are more reactive
- B. Have hydrogen bonding
- C. Have low melting point
- D. Have high density
Explanation: When added to water the carboxylic acids do not form dimers. Rather, hydrogen bonds are formed between the individual molecules of the…
Correct answer: Have hydrogen bonding- A. Aldehyde
- B. Alkyle Halide
- C. Ketones
- D. Alcohol
Explanation: Alcohol reacts with carboxylic acid to form ester
Correct answer: Alcohol- A. Ether
- B. Alcohol
- C. Water
- D. Both Options A and B are correct
Explanation: The question directly lifts from a statement in the Punjab book (11 Biology, Chapter 2: Biological Molecules).
Correct answer: Alcohol- A. Carbolic Acid
- B. Acetic Acid
- C. Carbonic Acid
- D. Oxalic Acid
Explanation: Explanation:Acetic acid is used in the manufacture of plastics such as poly vinyl acetate (rayon) and cellulose acetate (silk).Carbolic…
Correct answer: Acetic Acid- A. H3C-COO-C2H5
- B. H3C2-COO-CH3
- C. H3C2-CO-OH
- D. H3C2-COO-C2H5
Explanation: A is incorrect as the compound given is an ester which does not produce carbon dioxide upon reaction with sodium carbonate.B is incorrect…
Correct answer: H3C2-CO-OH- A. CCl3COOH > CHCl2COOH > CH2ClCOOH > CH3COOH
- B. CH3COOH > CHCl2COOH > CCl3COOH > CH2ClCOOH
- C. CHCl2COOH > CH3COOH > CCl3COOH > CH2ClCOOH
- D. CCl3COOH > CH3COOH > CHCl2COOH > CH2ClCOOH
Explanation: CCl3COOH > CHCl2COOH > CH2ClCOOH > CH3COOH: This option suggests that trichloroacetic acid (CCl3COOH) is the strongest acid, followed by…
Correct answer: CCl3COOH > CHCl2COOH > CH2ClCOOH > CH3COOH- A. Diethyl ether
- B. Methyl propyl ether
- C. Ethyl acetate
- D. Butyl alcohol
Explanation: Ethyl Acetate is an ester that is made when Ethanoic acid reacts with Ethanol.
Correct answer: Ethyl acetate