All Free Chemistry MCQs with Answers

• A. By the oxidation of primary alcohol
• B. By acid hydrolysis of alkane nitrite
• C. By the reaction R-Mg-Br with CO2 followed by acid hydrolysis
• D. By the reduction of aldehydes

Explanation: The reduction of an aldehyde, typically using a reducing agent like NaBH4 or LiAIH4 yields a primary alcohol.

• A. Alkanoyl chloride
• B. Alkyl alkanoate
• C. Alkane amide
• D. Alkanal

Explanation: An alkanal is another name for an aldehyde. While aldehydes can be oxidized to carboxylic acids, they are a separate class of compounds…

• A. Oxalic acid
• B. Malonic acid
• C. Adipic acid
• D. Fumaric acid

Explanation: Malonic acid is the common name for the dicarboxylic acid with three carbon atoms. Oxalic acid has two carbon atoms.

• A. LiAlH4
• B. NaBH4
• C. LiAlH4.H2O
• D. Both A and B

Explanation: LiAlH4 is a powerful reducing agent that can reduce. carboxylic acids to primary alcohols, such as converting butanoic acid to butanol…

• A. Propanoic acid
• B. Fluoroethanoic acid
• C. Trichloroethanoic acid
• D. Nitroethanoic acid

Explanation: Trichloroacetic Acid (TCA) is a much stronger acid than all the acids mentioned in the options, from a chemical ionization standpoint…

• A. Ester & Nitriles
• B. Nitriles and Amines
• C. Alkenes and Alkynes
• D. Esters and Alcohols

Explanation: Ester hydrolysis is a reaction that breaks an ester bond with a molecule of water or a hydroxide ion to form a carboxylic acid and an…

• A. Colourless liquid, vinegar like smell, sour taste
• B. Bright colour and bitter taste
• C. Colourless solid, sour taste, pungent smell
• D. All are incorrect

Explanation: Acetic acid have vinegar smell ,colorless liquid and sour taste.

• A. R - COOH
• B. R - CHO
• C. R - CO - R
• D. R - COO - R
• E. R- CO - NH2

Explanation: Amide functional group is given by −CO−NH2 . So (E) is correct option.

• A. Small sizes
• B. Polarity of C-O bond
• C. Hydrogen bonding
• D. Dipole-Dipole interactions

Explanation: Due to the presence of OH group as in COOH in the carboxylic acids ,they show hydrogen bonding and form dimers

• A. Benzyl acetate
• B. Octyl Acetate
• C. Amyl Butyrate
• D. Ethyl butyrate

Explanation: Option B is correct since octylacetate is classified as an ester that is formed from 1-octanol (octyl alcohol) and acetic acid.

• A. Water, Alcohol, Ether
• B. HCI, HBr, HI
• C. Bromine water
• D. All of these

Explanation: Acetic acid also known as ethanoic acid (CH3COOH) can form hydrogen bonds with water and alcohol since all three species have OH group.

• A. Benzoic Acid
• B. Propanoic acid
• C. Formic acid
• D. Picric acid

Explanation: Picric acid is 2,4,6-trinitrophenol. It does not contain a carboxylic group.

• A. HCl
• B. H2SO4
• C. CH3COOH
• D. H3PO4

Explanation: Option C "CH3COOH" is the right option.Organic compounds are universally weaker acids .

• A. Alcohol
• B. Aldehyde
• C. Ketone
• D. All of these options are correct

Explanation: We can get carboxylic acids by the oxidation of alcohols, aldehydes, and ketones as follows: R-CH2-OH + O2 → K2Cr2O7, H2SO4RCOOH R-CHO+0…

• A. Ethanol and sodium acetate
• B. Ethanol and acetic acid
• C. Ethanol only
• D. Formic acid

Explanation: In basic hydrolysis (saponification) of ethyl acetate:CH3COOC2H5 + NaOH → CH3COONa + C2H5OH→ Products: Sodium acetate (CH₃COONa) and…

• A. Unsaturated dicarboxylic 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…

• A. Stearic acid
• B. Palmitic acid
• C. Oleic acid
• D. Linoleic acid

Explanation: This is the correct answer. Octadecanoic acid is the IUPAC name for stearic acid.

• A. An ester
• B. An acid
• C. An alcohol
• D. A soap
• E. A base

Explanation: Ethanol (alcohol) can be produced by fermentation and concentrated using fractional distillation.

• A. Acid anhydride
• B. Carboxylic acid
• C. Amides
• D. Esters

Explanation: Aqueous acid chloride is a very acidic solution due to formation of a mixture of strong acid and a weak acid.

• A. Beta-hydroxy carboxylic acids
• B. Acids having one carbon more than the starting material
• C. Acids having one carbon less than the starting material
• D. Alpha-hydroxy acids

Explanation: Hydrolysis of nitriles produces a carboxylic acid with one extra carbon.