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The stability of dihalides of Si, Ge, Sn and Pb increases steadly in sequence...

a) PbX2 << SnX2 << GeX2 << SiX2

b) GeX2<< SiX2 << SnX2 << PbX2

c) SiX2 << GeX2 << PbX2 << SnX2

d) SiX2 << geX2 << SnX2 << PbX2

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(d) For group 14 stability of dihalide increases down the group

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