KVPY Sample Paper KVPY Stream-SX Model Paper-29

  • question_answer
    Two metals X and Y form covalent halides. Both halides can act as Lewis acids and a catalyst in Friedel Crafts reaction. Halide of X is polymer in the solid state and a dimer in the vapour state, which decomposes to monomer at 1200 K. However, halide of Y is a dimer in vapour state and becomes ionic in polar solvent. X and Y are respectively

    A) Be, Al

    B) Al, Be

    C) Be, Ca 

    D) Mg, Ca

    Correct Answer: A

    Solution :

    Covalent halides are formed by Be and Al among the metals given. The halide of Al, ie, \[A{{l}_{2}}C{{l}_{6}}\]becomes ionic in polar solvent. Hence Y is Al. Halide of Be is a polymer in solid sta l te. Thus X is Be.

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