Free Carboxylic Acids MCQs with Answers
550 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 are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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Read the Carboxylic Acids notesFree MDCAT chapter notes with key terms550 questions · page 18 of 28
- A. SO2 and HCl
- B. SOCl3 and H2O
- C. H2O4 and Cl2
- D. Only SO2
Explanation: This reaction takes place and the formation or the products leads to the formation of side products SO2 and HCl.
Correct answer: SO2 and HCl- A. CnH2nO3
- B. CnHnO2
- C. CnH2nO2
- D. CnH2nO
Explanation: The general formula of carboxylic acid is CnH2nO2.
Correct answer: CnH2nO2- A. Semi solid
- B. Ice like solid
- C. Viscous liquid
- D. Dilute liquids
Explanation: The term "glacial" in glacial acetic acid refers to the icy appearance of the solidified acetic acid.It is a liquid at relatively higher…
Correct answer: Ice like solid- A. Maleic acid
- B. Oxalic acid
- C. Phthalic acid
- D. Adipic acid
Explanation: Adipic acid is a dicarboxylic acid with the chemical formula HOOC(CH2)4COOH.
Correct answer: Maleic acid- A. Succinic acid
- B. Acetic acid
- C. Butyric acid
- D. Propionic acid
Explanation: All Carboxylic acids are not obtained by hydrolysis of fats because the hydrolysis of fats produces fatty acids which are monocarboxylic…
Correct answer: Succinic acid- A. CH3CN
- B. CH3CH2CN
- C. HCN
- D. NaCN+HCI
Explanation: Hydrolysis of an alkanenitrile on boiling with mineral acids or alkalis yields corresponding carboxylic acid.
Correct answer: CH3CN- A. 1-propanol
- B. Isopropyl cyanide
- C. n-propyl cyanide
- D. Ethyl cyanide
Explanation: Propanoic acid is produced through the acidic hydrolysis of ethyl cyanide (also known as ethanoic acid).
Correct answer: Ethyl cyanide- A. Basic
- B. Neutral
- C. Acidic
- D. Unpredictable
Explanation: K2CO3+2CH3COOH→2CH3COOK+CO2 +H2O CO2 is evolved which is acidic in nature
Correct answer: Acidic- A. H2O
- B. CO2 only
- C. H2O and CO`2
- D. H2 gas
Explanation: Carboxylic acids react with active metals (Na, K, Ca, Mg etc) to form their salts with the evolution of hydrogen gas.
Correct answer: H2 gas- A. -COOH group
- B. -OH group
- C. H atom
- D. OR
Explanation: For Nucleophilic substitution reaction of carboxylic acid →C-O bond breaks →-OH replace by -OR, -X, RCOO- and NH2
Correct answer: -OH group- A. Reaction of CH3COOH with Na
- B. Reaction of CH3COOH with NaHCO3
- C. Reaction of CH3COOH with Na2CO3
- D. Reaction of CH3COOH with PCl5
Explanation: The correct answer is Option D:Reaction of CH3COOH with PCl5. This reaction is a nucleophilic substitution reaction where the hydroxyl…
Correct answer: Reaction of CH3COOH with PCl5- A. NH3
- B. (NH4)2 SO4
- C. NH4CI
- D. NH4NO3
Explanation: Option A is correct.The by-product produced during the hydrolysis of alkane nitrile in a basic medium is ammonia (NH3).
Correct answer: NH3- A. Stronger acid
- B. Weaker acid
- C. Mild acid
- D. Very weak acid
Explanation: Option A is correct. The strength of an organic acid is measured by its pKa value. The smaller the pKa value, the stronger the acid.
Correct answer: Stronger acid- A. Strong acids
- B. Weak acids
- C. Mild acids
- D. Mineral acids
Explanation: Option B is correct.Organic acids are considered as weak acids.Weak acids are those acids that do not ionize completely in water.This…
Correct answer: Weak acids- A. K2Cr2O7H2SO4
- B. Na2Cr2O7/H2SO4
- C. KMnO4/H2SO4
- D. AgNO3/NH4OH
Explanation: Option D is correct.AgNO3/NH4OH is the weakest oxidizing agent that can be used in the oxidation of carboxylic acids.
Correct answer: AgNO3/NH4OH- A. Acetic acid and acid amide
- B. Acetic acid and methyl chloride
- C. Acetic acid and ammonia
- D. Acetic acid and ammonium chloride
Explanation: From Alkanenitriles: Compounds having a cyanide (-C≡N) group are called nitriles.Hydrolysis of an alkanenitrile on boiling with mineral…
Correct answer: Acetic acid and ammonium chloride- A. Magnesium formate
- B. Magnesium acetate
- C. Magnesium ion
- D. Carboxylate ion
Explanation: In the equation given in the above reaction acetic acid or ethanoic acid i.e.
Correct answer: Magnesium acetate- A. Orange
- B. Pineapple
- C. Banana
- D. Apple
Explanation: Esters have fruity smell and are used as artificial flavours.Flavours of some estersare listed in the table.Octyl acetate has flavour of…
Correct answer: Orange- A. NaNO3
- B. Acidified potassium dichromate
- C. H2SO4
- D. SOCl2
Explanation: A catalyst is a substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself…
Correct answer: H2SO4- A. Ketone
- B. Aldehyde
- C. Alcohol
- D. Carboxylic acid
Explanation: Hydrolysis of a nitrile involves the reaction of a nitrile functional group (RCN) with water (H2O) in the presence of an acid or base…
Correct answer: Carboxylic acid