We report on Australia Telescope observations of the massive star forming region G305.2+0.2 at 1.2 cm .
We detected emission in five molecules towards G305A , confirming its hot core nature .
We determined a rotational temperature of 26 K for methanol .
A non-LTE excitation calculation suggests a kinematic temperature of order 200 K. A time dependent chemical model is also used to model the gas phase chemistry of the hot core associated with G305A .
A comparison with the observations suggest an age of between 2 \times 10 ^ { 4 } and 1.5 \times 10 ^ { 5 } years .
We also report on a feature to the SE of G305A which may show weak Class I methanol maser emission in the line at 24.933 GHz .
The more evolved source G305B does not show emission in any of the line tracers , but strong Class I methanol maser emission at 24.933 GHz is found 3″ to the east .
Radio continuum emission at 18.496 GHz is detected towards two H II regions .
The implications of the non-detection of radio continuum emission toward G305A and G305B are also discussed .