Which Newman projection shows the most stable conformation of the following compound?

 

Consider the following molecules:

Choose the correct comparison of stability:

Which of the following represent most stabilised conformer of

Group at $\mathrm{I} \text{and} \mathrm{IV}$ positions are trans to each other. 

In the given four conformational isomers which of the following has minimum torsional strain and minimum van der Waal's strain

Which of the following is an achiral molecule?

The structure $\mathrm{I}$ and $\mathrm{II}$ are

Which of the following statements is true about the following conformer ($X$)?

Which of the Newman projections shown below represents the conformation about the ${\mathrm{C}}_1-{\mathrm{C}}_2$ bond of $1$-bromo-$2$-methyl propane?

Which point on the potential energy diagram is represented by Newman projection shown?