Home › NEET & JEE Chemistry MCQs › Hydrocarbons
NEET & JEE · Chemistry · Class 11

Hydrocarbons — NEET & JEE Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
₹0no login
Take the Hydrocarbons test →
Free · your all-India rank after you finish

Sample questions from this chapter

Which compound is an alicyclic hydrocarbon?
  1. Cyclohexane ✓
  2. Benzene
  3. Hex-1-ene
  4. Toluene
Answer: A. Cyclohexane is a non-aromatic cyclic hydrocarbon and is therefore alicyclic. The closest trap is benzene, whose cyclic structure is aromatic rather than alicyclic.
Why not B: Benzene is cyclic but aromatic, so it is not classified as alicyclic.
Why not C: Hex-1-ene is an open-chain unsaturated hydrocarbon.
Why not D: Toluene contains an aromatic benzene ring.
Which step propagates methane chlorination after a chlorine radical has formed?
  1. Cl· + Cl· → Cl2
  2. CH3· + CH3· → C2H6
  3. Cl· + CH4 → HCl + CH3· ✓
  4. Cl2 → 2Cl·
Answer: C. A chlorine radical abstracts H from methane, producing HCl and a methyl radical while continuing the radical chain. Cl2 homolysis is the closest mechanistic trap, but it is initiation.
Why not A: Combination of two radicals removes chain carriers and is a termination step.
Why not B: Methyl-radical coupling is also termination.
Why not D: Homolysis of chlorine under light initiates the chain but does not propagate it.
An alkene gives only propanone on reductive ozonolysis. Which alkene is it?
  1. 2,3-Dimethylbut-2-ene ✓
  2. 2-Methylpropene
  3. Hex-2-ene
  4. 3-Methylpent-2-ene
Answer: A. Symmetric (CH3)2C=C(CH3)2 cleaves into two identical propanone molecules. The closest trap, 2-methylpropene, has one matching carbon but its terminal CH2 also yields methanal.
Why not B: 2-Methylpropene gives propanone together with methanal, not propanone alone.
Why not C: Hex-2-ene gives ethanal and butanal.
Why not D: 3-Methylpent-2-ene gives ethanal and butan-2-one.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Hydrocarbons →

Other NEET Chemistry chapters

Some Basic Concepts of ChemistryStructure of AtomClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureThermodynamicsEquilibrium

All 19 chapters →

Questions

How many NEET and JEE questions are there on Hydrocarbons?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET and JEE Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.