MP Quiz M6L8

The empirical formula is defined as:

• The simplest whole-number ratio of atoms of each element in a compound.

• The actual number of atoms of each element in a molecule.

• The mass ratio of elements in a compound.

• The structural arrangement of atoms in a molecule.

Which of the following correctly represents the molecular, empirical, displayed, and skeletal formula for butan-1,4-diol?

• Molecular: C4H10O2, Empirical: C2H5O, Displayed: HOCH2CH2CH2CH2OH, Skeletal: OHC-CH2-CH2-CHO

• Molecular: C4H8O2, Empirical: CH2O, Displayed: CH3CH2CH2OH, Skeletal: CH3CH2CH2OH

• Molecular: C4H10O2, Empirical: C2H5O, Displayed: HOCH2CH2CH2CH2OH, Skeletal: (CH2)4(OH)2

• Molecular: C4H10O2, Empirical: C2H5O, Displayed: HOCH2CH2CH2CH2OH, Skeletal: HO-(CH2)4-OH

Stereoisomers (such as E/Z) are defined as:

• Compounds with the same molecular formula and connectivity but different spatial arrangement of atoms.

• Compounds with different molecular formulas.

• Compounds with the same molecular formula but different connectivity of atoms.

• Compounds that are mirror images and superimposable.

Which of the following correctly represents the E/Z stereoisomers of but-2-ene?

• E-but-2-ene and Z-but-2-ene

• cis-but-1-ene and trans-but-1-ene

• E-but-1-ene and Z-but-1-ene

• cis-but-2-ene and trans-but-2-ene

Select the correct repeat unit for polybut-2-ene.

• -[-CH2-CH=CH-CH2-]-

• -[-CH2-CH2-CH2-CH2-]-

• -[-CH=CH-CH=CH-]-

• -[-CH2-CH(CH3)-]-

What is the empirical formula?

• the simplest ratio of atoms in a compound

• the total number of atoms in a molecule

• the arrangement of atoms in space

• the molecular mass of a compound

For Butan-1,4-diol: What is the molecular formula?

• C4H10O2

• C4H8O2

• C4H10O4

• C5H10O2

For Butan-1,4-diol: What is the empirical formula?

• C2H5O

• C4H10O2

• CH2O

• C2H4O2

For Butan-1,4-diol: Identify the displayed formula from the diagram.

• C4H10O2

• C4H8O2

• C4H6O2

• C4H12O2

Stereoisomers have the same structural formula but a different arrangement in space.

• True

• False