Which class of organic compound is least likely to be used as an organic solvent? aldehyde ketone alkyl halide ether

 Aldehyde

Explanation:   The important property of any kind of solvent is to facilitate the mixing of reagents present in the reaction mixture and to mediate the proton transfer. Thus out of aldehyde, ketone, alkyl halide and ether, Aldehyde can be considered as the least used organic solvent.

Aldehyde is highly reactive in nature due to less steric hinderance unlike ketone which has hydrocarbon chain on the both sides of the carbonyl group.

Ether is a polar compound which is mostly used as the organic solvents like diethyl ether, tetrahydrofuran etc.

Some of the Ketones which are used as solvents re acetone, DMSO etc.

Alkyl halide like chloroform, dimethyl dichloride are also used as organic solvents.

The structure of each of the kind of solvent is attached in the image below -

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic