  A possible way of detecting the first structure formation in a non-standard
BBN Universe during the dark age, due to the resonant scattering of the CMBR
photons in the rotational lines of the primordial CH molecule is discussed. The
calculations are made within the framework of the $\Lambda$CDM cosmology and
plausible first structure physical conditions. The carbon chemistry during the
pregalactic epoch is considered. The relative abundance of the CH molecule is
found to be $10^{-14}$ whereas the adopted [C]/[H] ratio was taken to be
$10^{-10}$. The optical depth, dT/T and integration times are estimated. The
calculated optical depth turns out to have values that are rather high, that
clearly argue in favor of this molecule as an excellent candidate in searches
of first structure formation. Possible observations with the GMT and ALMA are
discussed.
