First organic molecule formed during chemogeny was
Chemical evolution proceeds from simplest carbon compounds to more complex polymers. Under reducing atmosphere, carbon combined with hydrogen to form methane, simplest organic molecule containing C-H bonds. Further energization produced ammonia derivatives and then amino acids. Methane served as carbon precursor in Miller-Urey mixtures. Understanding stepwise hierarchy clarifies progression from inorganic gases to monomers to polymers. Thus identification of Methane reflects earliest organic product before nitrogenous organics emerged. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype, phenotype and environment.
Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Chapter 1: Origin of Life.