Please help me out someone

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Which statement best describes the he properties of iconic compounds ?

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?