Draw two cyclic constitutional isomers of trans-1,2-dimethylcyclobutane with the same size ring.

Explanation: Constitutional isomers are the isomers having same molecular formula but have different connectivity of groups.

The two cyclic constitutional isomers of trans-1,2-dimethylcyclobutane having same ring size are:

These two isomers are shown in the image attached below.

petroleum? coal maybe?

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.