NEET Organic Chemistry 1 — Questions and Answers
Question 1: What is the general formula for alkanes (saturated hydrocarbons)?
- CnH2n
- CnH2n+2 (Correct answer)
- CnH2n-2
- CnHn
Correct answer: CnH2n+2
Alkanes follow the general formula CnH2n+2, as each carbon forms four single bonds with hydrogen or other carbons.
Question 2: Which functional group is present in alcohols?
- -COOH
- -CHO
- -OH (Correct answer)
- -NH2
Correct answer: -OH
Alcohols are characterized by the hydroxyl (-OH) functional group attached to a carbon atom.
Question 3: What type of reaction converts alkenes to alkanes by adding hydrogen?
- Oxidation
- Substitution
- Hydrogenation (Correct answer)
- Elimination
Correct answer: Hydrogenation
Hydrogenation adds H2 across a double bond in an alkene to form a saturated alkane, typically using a metal catalyst like Ni or Pt.
Question 4: Which compound is the simplest aromatic hydrocarbon?
- Toluene
- Cyclohexane
- Benzene (Correct answer)
- Naphthalene
Correct answer: Benzene
Benzene (C6H6) is the simplest aromatic hydrocarbon, featuring a ring of six carbon atoms with delocalized pi electrons.
Question 5: What is the IUPAC name for CH3-CH2-OH?
- Methanol
- Propanol
- Ethanol (Correct answer)
- Butanol
Correct answer: Ethanol
CH3-CH2-OH contains two carbon atoms with a hydroxyl group, making it ethanol (also called ethyl alcohol).
Question 6: Which type of isomerism involves compounds with the same molecular formula but different functional groups?
- Chain isomerism
- Position isomerism
- Functional group isomerism (Correct answer)
- Optical isomerism
Correct answer: Functional group isomerism
Functional group isomerism occurs when compounds have the same molecular formula but contain different functional groups, e.g., ethanol and dimethyl ether (both C2H6O).
NEET Organic Chemistry 1
What is the general formula for alkanes (saturated hydrocarbons)?