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JEE Main 2025 Jan 22 Shift 1, Chemistry Q10: Properties of Alkyl Halides (Halo Alkanes) & Aryl Halides (Halo Arenes)

JEE Main2025Jan 22, Shift 1Chemistry
Q.

Given below are two statements :

Statement I : CH O CH Cl will undergo S1 reaction though it is a primary halide.

Statement II : will not undergo S2 reaction very easily though it is a primary halide.

In the light of the above statements, choose the most appropriate answer from the options given below :

  1. A

    Statement I is incorrect but Statement II is correct.

  2. B

    Both Statement I and Statement II are incorrect

  3. C

    Statement I is correct but Statement II is incorrect

  4. D

    Both Statement I and Statement II are correct.

Solution

Statement I: Ionisation of CHOCHCl gives the carbocation CHO, which is strongly stabilised by lone-pair donation from oxygen (oxocarbenium resonance). This anchimeric stabilisation makes the S1 pathway feasible despite the carbon bearing Cl being primary.

Statement II: Neopentyl chloride, , has a bulky -butyl group adjacent to the reacting carbon. The three methyl groups sterically block backside attack by the nucleophile, so S2 is exceptionally slow.

Both statements are correct.

Concept behind this question

Properties of Alkyl Halides (Halo Alkanes) & Aryl Halides (Halo Arenes)Notes, formulas and examples →

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