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Haloalkanes and Haloarenes question

2005 · Shift 0 · Q50
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Haloalkanes and Haloarenes question

2005 · Shift 0 · Q50

JEE MainChemistryHaloalkanes and HaloarenesMCQ+4 / −1
Alkyl halides react with dialkyl copper reagents to give
  1. A
    alkenes
  2. B
    alkyl copper halides
  3. C
    alkanes
  4. D
    alkenyl halides
View written solutionFree

Correct answer: C

  1. Identify the reagent

    Dialkyl copper reagents are Gilman reagents, having the general formula: R2CuLiR_2CuLiR2​CuLi

  2. Recall the reaction of alkyl halides with Gilman reagents

    Gilman reagents react with alkyl halides via coupling reaction: R2CuLi+R′X→R−R′+RCu+LiXR_2CuLi + R'X \rightarrow R-R' + RCu + LiXR2​CuLi+R′X→R−R′+RCu+LiX

    The important product formed is a higher alkane due to carbon-carbon bond formation.

  3. Interpret the product type

    Since two alkyl groups get coupled, the organic product is: R−R′R-R'R−R′ which is an alkane.

  4. Check the options

    • A: alkenes — incorrect, no elimination is indicated.
    • B: alkyl copper halides — not the main organic product asked.
    • C: alkanes — correct.
    • D: alkenyl halides — incorrect.

  5. Final answer

    Alkyl halides react with dialkyl copper reagents to give alkanes.

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