Free Carboxylic Acids MCQs with Answers

• A. Sodium hydroxide
• B. Grignard's reagent
• C. Alcoholic KOH
• D. Alkaline KMnO_4

Explanation: This reaction is known as the "Grignard reaction with carbon dioxide". A Grignard reagent (RMgX, where R is an alkyl or aryl group, and X…

• A. Cyanohydrins
• B. Amino Acids
• C. Esters
• D. Amides

Explanation: Cyanohydrins are formed by the reaction of an aldehyde with hydrogen cyanide (HCN).

• A. Butanoic acid
• B. Propanoic acid
• C. Butyric acid.
• D. Acetic acid

Explanation: KMnO_4 is a strong oxidizing agent. When 2-butene is treated with KMnO_4 , it undergoes oxidative cleavage, breaking the double bond and…

• A. Alkyl halide
• B. Alcohol
• C. Water
• D. Acetaldehyde

Explanation: Alkyl nitriles are prepared by the reaction of alkyl halides with potassium cyanide (KCN) in a nucleophilic substitution reaction.

• A. As a coagulant for latex in rubber industry
• B. manufacture of pickles
• C. Used in silvering of mirrors
• D. None of these

Explanation: Acetic acid is used in the rubber industry as a coagulant for latex, and it's also used in the manufacture of pickles.

• A. Acetic
• B. Citrus
• C. Formic
• D. Butyric

Explanation: Vinegar is a dilute solution of acetic acid (CH_3 COOH) in water. It's produced by the fermentation of ethanol.

• A. Alcohol
• B. Ethers
• C. Esters
• D. Carboxylic Acids

Explanation: Esters are known for their pleasant, fruity smells. Many natural fruit flavors and fragrances are derived from esters.

• A. Carboxylic acid
• B. Esters
• C. Alcohol
• D. Amino Derivatives

Explanation: Esters are commonly used as protecting groups for carbonyl compounds. The carbonyl group (C=O) in aldehydes and ketones can be protected…

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: Amino acids are the building blocks of proteins. The simplest amino acid is glycine, which has the following…

• A. 7-8
• B. 8-9
• C. 10-11
• D. 9-10

Explanation: Oleic acid is an 18-carbon unsaturated fatty acid with a cis double bond between carbons 9 and 10.

• A. Carboxylic acid > alcohols > phenol > water
• B. Carboxylic acid > phenol > water > alcohol
• C. Water > alcohol > carboxylic acid > phenol
• D. Phenol > alcohol > water > carboxylic acid

Explanation: The acidic strength of a compound is determined by its ability to donate a proton (H+).

• A. C_3 H_8 O_4
• B. C_6 H_12 O_6
• C. C_2 H_2 O_4
• D. C_3 H_4 O_4

Explanation: Malonic acid is a dicarboxylic acid with the formula HOOC-CH_2 -COOH. This translates to C_3 H_4 O_4 .

• A. Strekers synthesis
• B. Williamson's synthesis
• C. Dow's method
• D. Sabatier-Sendern's synthesis

Explanation: The Strecker synthesis is a well-known method for preparing α-amino acids.

• A. C₃H₄O₄
• B. C₄H₄O₄
• C. C₆H₁₀O₄
• D. C₅H₁₀O₄

Explanation: Malonic acid is a dicarboxylic acid with the formula HOOC-CH₂-COOH. This translates to C₃H₄O₄.

• A. Common name
• B. IUPAC name
• C. Both a and b
• D. None of these

Explanation: Amino acids are commonly referred to by both their common names (e.g., glycine, alanine, valine) and their IUPAC names (e.g.…

• A. Phthalic acid
• B. Tartaric acid
• C. Picric acid
• D. Salicylic acid

Explanation: Aromatic compounds are cyclic, planar, and contain a conjugated system of pi electrons.

• A. Increase in molecular mass
• B. Decrease in molecular mass
• C. Both a and b
• D. None of these

Explanation: As the molecular mass of a carboxylic acid increases, the non-polar hydrocarbon chain becomes larger.

• A. Ear canal infection
• B. Pneumonia
• C. Abdominal pain
• D. Vomiting

Explanation: Acetic acid, in the form of diluted vinegar, is sometimes used to treat ear canal infections.

• A. Meat
• B. Fish
• C. Vegetables
• D. Both a and b

Explanation: Acetic acid, in the form of vinegar, is used as a marinade for both meat and fish.

• A. Aliphatic Monocarboxylic Acids
• B. Contain a suffix "al"
• C. Obtained from sugars
• D. With low boiling point

Explanation: Fatty acids are long-chain carboxylic acids that are typically found in fats and oils.