Answer all to the best of your ability please

2–Ethyl–3–methlypentanal.

Explanation:

To name the compound given in the question above, we must observe the following:

1. The functional group of the compound is Alkanal i.e Aldehyde,

—CHO and it is located at carbon 1.

Note: the aldehyde functional group is always at carbon 1 and there will be no need to state it's position in the compound.

2. The longest continuous carbon chain is 5 i.e pentane. But the presence of the functional group will replace the –e at the end of pentane with –al, making the name to the pentanal.

3. The substituents attached are:

a. Ethyl, CH2CH3 at carbon 2.

b. Methyl, CH3 at carbon 3.

4. Combine the above to get the name of the compound.

Therefore, the name of the compound is:

2–Ethyl–3–methlypentanal.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be