Can you get to the other end of the rainbow. Science says: no. Since rainbows are reflected and refracted light from the water droplets that are in the air after a rain they will move with you no matter how fast you go.
So, no, you can’t catch the rainbow. Interesting thing is that each of us see a rainbow different and, if you are in an airplane, you can see that it is a cicular multicolor ring of light. What petrichor is? Well, that is the smell after a rain or during a rain. More details in the video done by Vsauce.