All Free Chemistry MCQs with Answers

• A. CH3
• B. CH2
• C. CH
• D. CH4

Explanation: CH4, C2H6, and C3H8 are all consecutive alkanes in the homologous series, each differing from the next and previous compound by the…

• A. Wohler
• B. Berzelius
• C. Kesley
• D. Lyll

Explanation: According to the vital source theory, organic compounds must have their origin in living organisms and could not be synthesized by…

• A. Class
• B. Group
• C. Homologous series
• D. None of these options are correct

Explanation: Compounds that have the same functional group are part of the same homologous series. Eg: alcohol (OH) has the same homologous series.

• A. Closed chain hydrocarbons
• B. Open chain hydrocarbons
• C. Ring compounds
• D. Alicyclic compounds

Explanation: OPTION A: Closed-chain hydrocarbons are also called cyclic or alicyclic hydrocarbons.

• A. Lewis
• B. Wohler
• C. Greek Philosophers
• D. Berzillus

Explanation: The vital force theory stated that organic compounds could not be made in a lab, but needed a mysterious, God-given power that was found…

• A. Imides
• B. Amides
• C. Amines
• D. Carboxylic acid

Explanation: Option A : Urea doesn't belong to imides. Option: B Urea, also called carbamide, is an organic compound with the chemical formula…

• A. Amino acids
• B. Ammonium carbonate
• C. Ammonium cyanate
• D. Xanthin

Explanation: The 'Wöhler synthesis' is the conversion of ammonium cyanate into urea. This chemical reaction was described in 1828 by Friedrich Wöhler.

• A. Homocyclic compounds
• B. Alicyclic Compounds
• C. Heterocyclic compounds
• D. None of these options are correct

Explanation: Heterocyclic compounds are those that have at least two different elements as members of their rings.

• A. Aromatic compounds
• B. Branched chain compounds
• C. Alicyclic compounds
• D. None of these

Explanation: The IUPAC name of Isopentane is Methybutane having the formula: C5H12. Since it has one methyl group attached, which serves as a compound…

• A. 850,000
• B. Over 6 million
• C. 6 million
• D. 5 million

Explanation: Option B is correct as we know an estimated "20 million" different organic compounds.

• A. Heterocyclic compounds
• B. Alicyclic compounds
• C. Aliphatic compounds
• D. Carbocyclic compounds

Explanation: d) Carbocyclic compounds: Carbocyclic compounds are another term used to describe homocyclic compounds.

• A. Living things
• B. Non living things
• C. Fossils
• D. Sea water

Explanation: Organic compounds are obtained from living things. Among the numerous types of organic compounds, four major categories are found in all…

• A. Polar solvents
• B. Water
• C. Ammonium cyanate
• D. Non-polar solvents

Explanation: Organic compounds are soluble in non-polar solvent. A non-polar solute will be dissolved by a non-polar solvent because the two are…

• A. Divalent
• B. Monovalent
• C. Trivalent
• D. Tetravalent

Explanation: Option A: Divalent: Divalent atoms have two valence electrons in their outermost shell, such as oxygen or sulfur.Option B: Monovalent…

• A. Living things
• B. Non-living things
• C. Fossils
• D. Sea water

Explanation: Organic compounds typically consist of groups of carbon atoms covalently bonded to hydrogen, usually oxygen, and often other elements as…

• A. Glycol and cyclohexanol
• B. Formaldehyde and benzol
• C. Diethyl ether and ethyl alcohol
• D. Methanal and acetone

Explanation: Methanal is an aldehyde while acetone is a ketone. Both compounds have a similar structure as they contain a carbonyl group.

• A. Amino acids
• B. Ammonium carbonate
• C. Ammonium cyanate
• D. Xanthin

Explanation: Friedrich Wöhler prepared urea from ammonium cyanate, an inorganic compound.

• A. Alicyclic
• B. Aromatic
• C. Acyclic compounds
• D. Carbocyclic compounds

Explanation: Here are the definitions of each of the above terms: Alicyclic: contains one or more all-carbon rings which may be saturated or…

• A. 1900
• B. 1829
• C. 1850
• D. 1828

Explanation: In 1828, Wohler synthesized urea by slowly evaporating a water solution of ammonium cyanate, which he had prepared by adding silver…

• A. Class
• B. Group
• C. Homologous series
• D. None of these options is correct

Explanation: The compounds which belong to the same functional group form a homologous series.