Relative energies are in the order:
s < p < d < f
And the shape of these orbitals are
s - spherical
p - dumbbell
d - double dumbbell
f - double double dumbbell
The peak at 1620-1680 cm⁻¹ is characteristic absorption peak of C=C stretching while peak at 3010-3100 cm⁻¹ is characteristic absorption peak of C-H streching in which C is sp² hybridized.
It means that the structure contains carbon double bond carbon but there is no H attached to sp² hybridized carbon.
I have drawn one structure which follows the scenario. And molecular formula of Molecule is
C₆H₉N.
Result: According to given information the best suggested compound has formula
C₆H₉N with structure shown below,
The paleoatmosphere refers to the Earth’s atmosphere
in the geological past. The paleoatmosphere was dominated by nitrogen, carbon
dioxide and methane. These gases are generated by the radioactive decay of
Potassium. During this pre-biological atmosphere, it is thought to have been
reducing, to have highly contained virtually no free oxygen, and virtually no
argon. Therefore the major gases on this period are the Nitrogen and Carbon Dioxide.