Please help me PLEASE 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

1.B

You need to break bonds to pass from an isomer to another. You do not need that for conformers.

2.D

But answer A is not always true (i.e double bond C=C).Organic compounds are thought of as consisting of a relatively unreactive backbone, for example a chain of  hybridized sp3 carbon atoms, and one or several functional groups. The functional group is an atom, or a group of atoms that has similar chemical properties whenever it occurs in different compounds. It defines the characteristic physical and chemical properties of families of organic compounds.

3.A

A condensation also produces a small molecule (H2O, NH3...)

A drug has a biological activity.

4.D