Answer:
Increasing order of thermal
stability :
As
the bond length decreases bond dissociation enthalpy increases and
correspondingly thermal stability increases.
(ii) Reducing
power :
This is also due to bond
dissociation energy. The greater the bond dissociation energy greater will be
the stability and hence weaker is the reducing agent.
(iii) Boiling
point : 
.
From 
to 
boiling
point increases due to increase in size of the molecule which results in
increase in the magnitude of van der Waals forces of attraction. But the exceptional
behaviour of HF is due to its ability to form intermolecular H-bonding.
(iv) Increasing
acidic character :
As the bond
length increases bond dissociation energy decreases and hence acidic character
increases.
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