The stability of monohalides of group 13 elements

The stability of monohalides of group 13 elements

  1. A

    increases down the group.

  2. B

    decreases down the group.

  3. C

    first increases and then decreases.

  4. D

    first decreases and then increases.

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    Solution:

    The reluctancy of s-electrons to participate in bonding is the inert pair effect. This effect is more pronounced in heavier metals where s-electrons do not show participation in bonding. This effect is observed on moving down in a group.

    There are two oxidation states of group-13 elements: +3 and +1. The stability of the +1 oxidation state increases down the group because of the inert pair effect. The oxidation state of group-13 element in monohalide is +1. This implies that the stability of monohalides increases on moving down the group.

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