MCQ
How many isomers are possible for the following molecule ?


- A$1$
- B$2$
- C$3$
- D$4$

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$3 s^{2}$; $3 s^{2} 3 p^{1}$; $3 s ^{2} 3 p ^{3}$; $3 s^{2} 3 p^{4}$
The correct order of first ionization enthalpy for them is.