Chemistry / physics questions?

Question

1. how do conformations differ from structural isomers?

A structursl isomers have the same chemical and physical characteristics while conformations do not.

B. in structural isomeres the atoms are offered in diffrent ways while in conformations the atoms are ordered in the same way

C. structural isomers look like each other while conformations do not

2.a functional group

A. contains heteroatoms

B. is a group of atoms whichbehave as a unit

C. are found in organic molecules

D. all of these

3. when monomers join together by forming single covalent bonds what is produced?

A.a addition polymer

B. a condensation polymer

C. a drug

D. all of these

4. when monomers join together by losing a small molecule from a functional group what is produced?

A. an addition polymer

B. a condensation polymer

C. a drug

D. none of these

Answer 1

what is unit vector