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NEET & JEE · Chemistry · Class 12

Haloalkanes and Haloarenes — NEET & JEE 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 allylic halide?
  1. CH2=CHCH2Cl ✓
  2. CH2=CHCl
  3. C6H5Cl
  4. C6H5CH2CH2Cl
Answer: A. In CH2=CHCH2Cl, Cl is on an sp3 carbon adjacent to C=C, which defines allylic. Vinyl chloride is the closest trap because it contains the same atoms but Cl is directly on the double bond.
Why not B: Here chlorine is directly bonded to an sp2 alkene carbon, making a vinylic halide.
Why not C: Chlorobenzene is an aryl halide with Cl directly on the aromatic ring.
Why not D: The chlorine-bearing carbon is two bonds from the phenyl ring and is neither allylic nor benzylic.
What is the major product of CH3CH2Br with aqueous KOH?
  1. Ethene
  2. Ethane
  3. Ethanol ✓
  4. Diethyl ether
Answer: C. Aqueous OH− substitutes Br in primary bromoethane to give ethanol. Ethene is the nearest condition-dependent trap from alcoholic base.
Why not A: Ethene is favoured by hot alcoholic KOH through beta-elimination.
Why not B: Ethane requires reduction, not hydroxide substitution.
Why not D: Ether formation would require an alkoxide nucleophile in a Williamson reaction.
(R)-2-bromobutane reacts by a clean SN2 pathway with OH-. What stereochemical product is expected?
  1. The alcohol with inverted configuration at C-2 ✓
  2. A 1:1 racemic mixture of butan-2-ol
  3. The alcohol with retained arrangement at C-2
  4. But-2-ene with unchanged stereocentre
Answer: A. Concerted backside displacement inverts the arrangement at the reacting carbon. A racemate is the closest stereochemical trap from applying SN1 behaviour.
Why not B: Racemisation requires a planar carbocation in SN1.
Why not C: Backside attack forces inversion rather than retention.
Why not D: The stated pathway is substitution, and elimination would remove the stereocentre.

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Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Haloalkanes and Haloarenes →

Other NEET Chemistry chapters

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

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Questions

How many NEET and JEE questions are there on Haloalkanes and Haloarenes?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 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.