NEET Hydrocarbons — Set 12

Question 1

Which hydrocarbon class has the highest carbon-to-hydrogen ratio?

Accepted Answer

Alkynes ($ \ce{C_nH_{2n-2}} $) have the highest C:H ratio (e.g., $ \ce{C2H2} $ is 1:1) compared to alkanes ($ \ce{C_nH_{2n+2}} $) or alkenes ($ \ce{C_nH_{2n}} $).

Question 2

What is the hybridization of carbon atoms in alkanes?

Accepted Answer

In alkanes, carbon atoms form four single bonds, resulting in $ sp^3 $ hybridization, as seen in their tetrahedral structure.

Question 3

Which hydrocarbon is a liquid at room temperature?

Accepted Answer

Hexane ($ \ce{C6H14} $), with 6 carbons, is a liquid at room temperature (boiling point ~68°C), unlike lower alkanes which are gases.

NEET Chemistry: Hydrocarbons — Practice Set 12

Q1. Which hydrocarbon class has the highest carbon-to-hydrogen ratio?

Q2. What is the hybridization of carbon atoms in alkanes?

Q3. Which hydrocarbon is a liquid at room temperature?

Q4. Which hydrocarbon has the molecular formula \( \ce{C3H4} \)?

Q5. What is the \( \ce{C-H} \) bond length in alkanes?

Q6. Which hydrocarbon would require the least amount of oxygen per carbon atom for complete combustion?

Q7. Which hydrocarbon is used as a domestic fuel with the least pollution?

Q8. What is the effect of unsaturation on the reactivity of hydrocarbons?

Q9. Which group activates the benzene ring towards electrophilic substitution?

Q10. A hydrocarbon with 7 carbon atoms and 12 hydrogen atoms has one ring. What is its IUPAC name?