NEET NEET SOLVED PAPER 2016 Phase-I

  • question_answer
    Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?                                                                                                                                                                                  

    A)  \[{{I}_{2}}>\text{ }B{{r}_{2}}>\text{ }C{{l}_{2}}>{{F}_{2}}\]

    B)   \[C{{l}_{2}}>\text{ }B{{r}_{2}}>\text{ }{{F}_{2}}>\text{ }{{I}_{2}}\]

    C)   \[B{{r}_{2}}>\text{ }{{I}_{2}}>\text{ }{{F}_{2}}>\text{ }C{{l}_{2}}\]

    D)   \[{{F}_{2}}>\text{ }C{{l}_{2}}>\text{ }B{{r}_{2}}>\text{ }{{I}_{2}}\]

    Correct Answer: B

    Solution :

                     \[C{{\ell }_{2}}>B{{r}_{2}}\underset{\text{due to high }{{\ell }_{p}}-{{\ell }_{p}}\text{ repulstion}}{\mathop{\underset{\downarrow }{\mathop{>{{F}_{2}}>{{I}_{2}}}}\,}}\,\]


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