NEET Chemistry / AI question bank / NCERT Class 12 / Organic Compounds Containing Halogens
Haloalkanes and Haloarenes: NEET questions with solutions
NEET questions here turn on mechanism: SN1 versus SN2 rates, inversion versus racemisation, Saytzeff elimination, why haloarenes resist substitution, and named reactions such as Finkelstein, Swarts, Wurtz-Fittig and Sandmeyer. Marks are lost on ranking reactivity with the wrong mechanism in mind and on forgetting resonance in the aryl C–X bond.
Also called: alkyl halides · SN1 and SN2 reactions · nucleophilic substitution
Questions
10 questions / answers after you pick
- Q1Which bromide reacts fastest with NaI in acetone by the SN2 mechanism?
SN2 mechanismEasySingle correct
- Q2Heating CH₃Br with AgF gives CH₃F. What is this reaction called?
Preparation of haloalkanesEasySingle correct
- Q3Why does chlorobenzene undergo nucleophilic substitution far less readily than chloroethane?
Reactions of haloarenesEasySingle correct
- Q4Arrange these chlorides in order of DECREASING reactivity by the SN1 mechanism: (I) C₆H₅CH₂Cl, (II) CH₃CH₂CH₂Cl, (III) (CH₃)₂CHCl, (IV)…
SN1 mechanismMediumSingle correct
- Q52-Bromopentane is heated with alcoholic KOH. What is the major product?
Elimination reactionsMediumSingle correct
- Q6Ethylmagnesium bromide is prepared from bromoethane and magnesium in dry ether. If a little water is added to it, what forms?
Reactions with metalsMediumSingle correct
- Q7Optically active (R)-2-bromobutane is treated with hydroxide ion under conditions that favour the SN2 mechanism. Judge the Assertion (A) and…
Stereochemistry of substitutionMediumAssertion–Reason
- Q8Several polyhalogen compounds were once widely used but are now restricted. Which of the statements below about them are correct?
Polyhalogen compoundsMediumStatement based
- Q9Four named reactions start from a halogen compound or a diazonium salt. Match each reagent set in List I with the organic product it gives…
Named reactionsHardMatch the following
- Q10Which compound undergoes substitution of chlorine by OH⁻ most easily?
Reactions of haloarenesHardSingle correct
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