Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this purpose?

[R_H = 1 $$ \times $$ 10⁵ cm^–1, h = 6.6 $$ \times $$ 10^–34 Js, c = 3 $$ \times $$ 10⁸ ms^–1]

The element that usually does NOT show variable oxidation states is :

Which compound (s) out of the following is/are not aromatic ?

Among the following compounds, which one is found in RNA ?