The correct decreasing order of basic strength is:
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
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(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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