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Hydrocarbons — NEET Chemistry MCQs

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

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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.

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

Other NEET Chemistry chapters

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Questions

How many NEET 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 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.