P, Z, C and J are the elements belonging to 17th group of Modern periodic table. The correct trend of Bond dissociation enthalpy of these elements is P2 > Z2 > C2 > J2. The element ‘Z’ in the sequence is

P, Z, C and J are the elements belonging to 17th group of Modern periodic table. The correct trend of Bond dissociation enthalpy of these elements is P2 > Z2 > C2 > J2. The element ‘Z’ in the sequence is

  1. A

    F

  2. B

    Br

  3. C

    I

  4. D

    Cl

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    Solution:

    Atomic radius….F<Cl<Br<I;

    Density ….F<Cl<Br<I;

    IP ….F>Cl>Br>I;

    EN ….F>Cl>Br>I;

    Electron gain enthalpy ….I<Br<F<Cl; Due to small size and inter electronic repulsions in Fluorine ;

    IP …..I-<Br-<F-<Cl-;

    IP trend….F>Cl>Br>I>Cl->F->Br->I-

    B.D.E….Cl2>Br2>F2>I2; Due to small size and repulsions between lone pairs on adjacent Fluorine atoms ;

    IP …..I-<Br-<F-<Cl-;

    Reactivity and oxidizing power…..F2>Cl2>Br2>I2;

    Hydration enthalpy…F->Cl->Br->I-;

    MP and BP ….F2<Cl2<Br2<I2; Due to increased strength of London dispersion forces;

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