MCQ
The outermost electronic configuration of p-block elements varies from ns2 np1 to:
- Ans2 np5
- Bns2 np4
- Cns2 np6
- Dns2 np3
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$(A)$ Pentane
$(B)\,2-$ Methyl butane
$(C)\,2,2-$ Dimethyl propane


$(i) $ in filling a group of orbitals of equal energy, it is energetically preferable to assign electrons to empty orbitals rather than pair them into a particular orbital.
$(ii)$ When two electrons are placed in two different orbitals, energy is lower if the spins are parallel.are valid for