It Isn’t exactly like the interaction of chemicals because the processes involved in those interactions are pretty well understood. That isn’t the case with DNA.
When the four nucleotide bases — adenine, cytosine, guanine, thymine — are ordered within the DNA strand, the bonding (how they attach to the structure) is understood but the sequencing or ordering of the bases in the structure appears completely random. Yet, the sequencing of the bases is precisely how the information is encoded into the molecule. So the question is how could the complex information that regulates the development of all life on earth have been arrived at completely fortuitously? That information is crucial because its transcription into mRNA molecules serves as the templates for the construction of the myriad of functional protein strands which carry out the millions of tasks within cells which keep living things, well, living. The explanation for how the original sequencing of the bases (I.e., the stored information to regulate all the functions in a living cell) occurred in the first place to permit the production of a sufficiently functional mechanism by which the genetic code could reproduce itself in survivable form remains a mystery.
Long story short: before the genetic code could successfully reproduce itself (and thereby benefit from adaptive change) there had to obtain a sufficiently complex coding (achieved completely by random bonding) which “magically” hit upon the sophisticated information set minimally required to enable the capacity for self-replication. An astoundingly fortuitous event – on a completely different level of causality from the simple chemical reaction in your example.
At least let’s try to represent what needs to be explained – and not explained away – accurately and adequately.