A strong , sharp absorption at about 1730 wavenumbers (IR) (True) A sharp singlet in the region of delta = 3.5 ppm (NMR) An important pair of moderately strong absorptions at about 800 and 900 wavenumbers (IR) A strong , broad absorption at about 3300 wavenumbers (IR) A triplet at about delta = 2.2 ppm , integrating for 2 protons (NMR)

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.