Question

account for the following:
(a) Lead does not form Pbl4
(b) phosphine has lower boiling point than ammonia.
(c) BF3 acts as Lewis acid while CCl4 cannot do so.​

Answer 1

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The Iodide reduces the lead to Pb(II) and the Pb oxidizes the Iodide to Iodine (I2). Since iodide is not a strong enough reducing agent to reduce Pb(II) to Pb, the ionic compoundPbI2 is formed. Pb4+ , being a strong acid (strong oxidant) will take up electrons from soft base (have fairly good reducing power) I- to oxidise it to I2 and it self will reduce to Pb2+ to form PbI2❤️❤️❤️