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NEET 2026, Chemistry Q20: Preparation of Alkyl Halides (Halo Alkanes) & Aryl Halides (Halo Arenes)

NEET2026Chemistry
Q.

In the following reaction sequence, X and Z, respectively are :

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

Solution

1-Propanol with PCl gives 1-chloropropane along with POCl and HCl, so X = POCl.

1-Chloropropane heated with alcoholic KOH undergoes dehydrohalogenation to give propene (Y = CH–CH=CH).

Addition of HBr to propene in the presence of benzoyl peroxide follows the anti-Markovnikov (Kharasch) pathway, giving 1-bromopropane: Z = CHCHCH–Br.

Concept behind this question

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