In which of the following molecules, all atoms given are coplanar?

Ans is option 1. I have seen on several different sites they are only giving explanations for 1st option. Can anyone please explain the hybridisation of the rest of the options and why they are wrong ?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane