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 25 of 28
- A. A
- B. B
- C. C
- D. D
Explanation: In terms of electrophilic character, carboxyl groups are not as reactive as carbonyl groups.
Correct answer: C482. Fatty acids are:
- A. Linsaturated dicorboxylic acid
- B. Long chain alkanoic acid
- C. Aromatic carboxylic acid
- D. Aromatic dicarboxylic acid
Explanation: Alkanoic acids are alkane-derived organic compounds that contain the carboxylate (-COOH) functional group and fatty acids are carboxylic…
Correct answer: Long chain alkanoic acid- A. Structural isomers
- B. Stereo isomers
- C. Enantiomers
- D. Diasteromers
Explanation: Both Ethanol and Dimethyl ether have the same molecular formula but different structures. Hence they are structural isomers of each other.
Correct answer: Structural isomers- A. Electrophillic substitutions
- B. Nucleophllic substitution
- C. Electrophillic addition
- D. Nucleophillic addition
Explanation: The carboxyl (COOH) group is named after the carbonyl group (C=O) and a hydroxyl group.
Correct answer: Nucleophllic substitution- A. Two alcohols
- B. Carboxylic acid and alcohol
- C. Ketone and alcohol
- D. Aldehyde and alcohol
Explanation: Esters are made by the reaction of a carboxylic acid with an alcohol, a process that is called esterification.
Correct answer: Carboxylic acid and alcohol- A. R - NH2
- B. R - COCl
- C. RCOOH
- D. RCH2 - OH
Explanation: This is the correct option. Acyl chlorides (R-COCl) react readily with NaOH due to their highly reactive nature.
Correct answer: R - COCl- A. Acetic acid+HCl+H3PO4
- B. Acetic acid+PCl5
- C. Acetic acid+PCl3
- D. Acetic acid+C'2+H3PO4
Explanation: Acyl chloride and Phosphorous Acid are the products of the reaction of Acetic Acid and PCl3 .
Correct answer: Acetic acid+PCl3- A. Chlorine releases electrons and destabilizes ClCH2CO2- anion
- B. Chlorine releases electrons and stabilizes the ClCH2CO2- anion
- C. Chlorine withdraws electrons destabilizes ClCH2CO2- anion
- D. Chlorine withdraws electreon and stabilizes the ClCH2CO2- anion
Explanation: The general equation is: HA--->H++A- When A- formed is more stbale, the equilibrium lies more to the right.
Correct answer: Chlorine withdraws electreon and stabilizes the ClCH2CO2- anion- A. By the oxidation of alcohol
- B. By acid hydrolysis of alkane nitrile
- C. By the reaction R-Mg-Br with CO2 followed by acid hydrolysis
- D. By the reduction of aldehydes
Explanation: In fact, by the reduction of aldehydes alcohols are obtained instead of carboxylic acids.While its oxidation gives Carboxylic Acids.
Correct answer: By the reduction of aldehydes- A. Dehydration of carboxylic acid with P2O5
- B. Reaction of carboxylic acid with SOCl2
- C. Reaction of carboxylic acid with NH3
- D. Reaction of carboxylic acid with alcohol in the presence of conc. H2SO4
Explanation: Acid anhydride is prepared when carboxylic acids are dehydrated on heating strongly in the presence of phosphorus pentoxide P2O5 .
Correct answer: Dehydration of carboxylic acid with P2O5- A. Acid amide
- B. Acid halide
- C. Ester
- D. Acid anhydride
Explanation: Among the derivative of carboxylic acid, the acid halide is more reactive because the halogen group is good leaving.
Correct answer: Acid halide- A. Presence of hydrogen at ∞-carbon
- B. Condensation reaction
- C. Presence of carboxylic group
- D. Hydrogen bonding
Explanation: The oxygen atom carbonyl group of one carboxylic acid forms hydrogen bond with hydrogen atom of hydroxyl group of other carboxylic acid.
Correct answer: Hydrogen bonding- A. H-atom of R group
- B. Carbonyl group
- C. H-atom of OH group
- D. Carboxylic group
Explanation: Reaction with carboxylic acid and carbonates are example of E-substituition. Na+CH3COOH→ CH3COONa+1/2 H2 , So, O-H bond break
Correct answer: H-atom of OH group- A. Electrophilic substitution
- B. Nucleophilic addition
- C. Nucleophilic substitution
- D. Oxidation
Explanation: Esterification is an example of a Nucleophilic substitution reaction. During the mechanism when alcohol attacks through lone pair of…
Correct answer: Nucleophilic substitution- A. CH3COOH, HCI
- B. CH3COOH, PCI5
- C. CH3COOH, SOCI2
- D. Both "B" and "C"
Explanation: The addition of a nucleophile to the carboxyl group is always followed by the displacement of the OH group by some other group, producing…
Correct answer: Both "B" and "C"- A. Reaction of CH3COOH with Na
- B. Reaction of CH3COOH with NaHCO3
- C. Reaction of CH3COOH with Na2 CO3
- D. Reaction of CH3COOH with PCI5
Explanation: CH3,COOH+PCI5 → CH3-CO-CI+ POCI3+HCI, In this reaction C-O bond of carboxy
Correct answer: Reaction of CH3COOH with PCI5- A. OH-
- B. RCCO-
- C. -OR
- D. PhO-
Explanation: Option Ais correct.Hydroxide ion is the conjugate base of water (H2O).Water is a weak acid (in pure form) with a pKa of about 15.7.
Correct answer: OH-- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: This is correct option as it contains functional group of carboxylic acids.
Correct answer: Option A- A. methyl formate
- B. methyl acetate
- C. ethyl acetate
- D. ethyl formate
Explanation: Option D is the correct answer. Ethyl formate is an ester with the formula HCOOCH2CH3.When hydrolyzed, it produces ethyl alcohol…
Correct answer: ethyl formate- A. HClO
- B. HClO2
- C. HClO4
- D. HClO3
Explanation: The increasing order of acid strength HClO4,HClO3,HClO2,HClO is: HClO<HClO2<HClO3<HClO4.
Correct answer: HClO4