With suitable illustration explain the theory of Craig and Paddock for a bonding in phosphazenes. Give some synthetic routes for polyphosphazenes.

The theory of Craig and Paddock for bonding in phosphazenes explains the unique bonding structure in these compounds, where alternating phosphorus and nitrogen atoms are linked in a ring or chain. According to this theory, the bonding in phosphazenes involves both covalent bonding and ionic character. The phosphorus atom is considered to have a formal oxidation state of +5, while nitrogen __________ ______ ___ ______ _____.
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