Recаll thаt in оrgаnic cоmpоunds, there are often many hydrogens attached to carbon atoms, so they are typically omitted in bond‑line structures. How many hydrogen atoms are bonded to the indicated carbons in the Vitamin D₃ molecule? Carbon 1 is bonding to [1] hydrogen(s).Carbon 2 is bonding to [2] hydrogen(s).Carbon 3 is bonding to [3] hydrogen(s).