1.

The correct decreasing order of basic strength is:(a) AsH3 > SbH3 > PH3 > NH3(b) SbH3 > AsH3 > PH3 > NH3(c) NH3 > PH3 > AsH3 > SbH3(d) PH3 > AsH3 > SbH3 > NH3

Answer»

(c) As the size of central atom increases the lone pair of electrons occupies a larger volume. In other words electron density on the central atom decreases and consequently its tendency to donate a pair of electrons decreases along with basic character from NH3 to BiH3



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