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16th group elements S, Se, Te and Po form different type of halides; the hexa, tetra, di and monohalides. The polarity of the M – F bond increases as the size of the atom M increases Tetrafluorides and tetrachlorides are formed by almost all elements while Te and Po form solid tetraiodides. Only sulphur forms the dihalide, SCl2
Lewis acid character of SCl4, SeCl4 and TeCl4 is in the order
(A) TeCl4 > SeCl4 > SCl4
(B) SCl4 > SeCl4 > TeCl4
(C) SeCl4 > SCl4 > TeCl4
(D) SCl4 > TeCl4 > SeCl4
(A) Greater the ability of MCl4 to accept electron pairs, greater will be its Lewis acid character. Since all chlorides, the Lewis acid character depends upon the electronegativity of M. Te has the least electronegativity among Te, Se and S, and hence, TeCl4 is the best electron pair acceptor and SCl4 is the poorest Lewis acid.
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