Lesson 11 Carbon and Its Compounds

Q1. What is the general formula of alkenes?

CₙH₂ₙ CₙH₂ₙ₊₂ CₙH₂ₙ₋₂ CₙHₙ₊₂

Q2. What is the formula of ethanol?

C₂H₅OH CH₃OH CH₃COOH C₂H₅COOH

Q3. Rectified spirit contains approximately:

95.5% ethanol 55.5% ethanol 75% ethanol 100% ethanol

Q4. What is the molecular formula of methane?

CH₄ C₂H₆ C₂H₄ CH₃OH

Q5. C₃H₆ belongs to which class?

Alkene Alkane Alkyne Carboxylic acid

Q6. What is the functional group of an alcohol?

–OH –CHO –COOH –CO–

Q7. Esters generally have:

Pleasant/fruity smell Always unpleasant smell Always no smell Chlorine smell

Q8. C₂H₂ is which type of hydrocarbon?

Alkyne Alkene Alkane Ether

Q9. What gas is evolved when ethanol reacts with sodium metal?

Hydrogen Oxygen Carbon dioxide Nitrogen

Q10. What is the formula of ethyne?

C₂H₂ C₂H₄ C₂H₆ CH₄