Question 1

The molecule shown in the first image is chloromethane (CH$$_3Cl). $$Based on the direction of the bond dipoles and the overall molecular geometry, which statement best describes the polarity of this molecule?

Accepted Answer

The molecule is polar because the bond dipoles reinforce each other, resulting in a net dipole moment toward the chlorine.

Question 2

The second image shows the structure of n-pentane. Which of the following statements is true about n-pentane?

Accepted Answer

It is a saturated hydrocarbon with the molecular formula C$$_5H$_{12}.$$

Question 3

Which of the following compounds is a structural (constitutional) isomer of n-pentane, as shown in the third image?

Accepted Answer

2-methylbutane

Question 4

The fourth image shows the structure of ethene (C$$_2H$_4). $$Which type of reaction would convert ethene into an alcohol?

Accepted Answer

Hydration, which adds H and OH across the double bond.

Question 5

The fifth image shows a line-angle structure. What is the IUPAC name for this compound?

Accepted Answer

2-methylpropane

Question 6

Which of the following molecules, as shown in the sixth image, can exist as a pair of cis–trans isomers?

Accepted Answer

2-butene

Question 7

The seventh image shows a line-angle structure. Which class of hydrocarbon does this molecule belong to?

Accepted Answer

Alkane

Question 8

Refer to the eighth image showing various carbonyl-containing functional groups. Which functional group is present in acetone?

Accepted Answer

Ketone

Question 9

The ninth image shows the structure of 2-butanol. What is the main oxidation product of 2-butanol?

Accepted Answer

2-butanone

Question 10

The tenth image shows the structure of pentanal. Which functional group is present in this molecule?

Accepted Answer

Aldehyde

Question 11

The eleventh image shows the structure of pentanoic acid. Which functional group is present in this molecule?

Accepted Answer

Carboxylic acid

Question 12

The twelfth image shows the structure of 2-butanol. What class of alcohol is this compound?

Accepted Answer

Secondary (2°) alcohol

Question 13

The thirteenth image shows the structure of pentanal. What is the product of complete oxidation of this compound?

Accepted Answer

Pentanoic acid

Question 14

The fourteenth image shows the structure of pentanoic acid. What is the expected charge of this molecule at pH 7?

Accepted Answer

Negatively charged (as COO$$^-)$$

Question 15

The fifteenth image shows the structure of isopropanol. Which of the following statements is true about this molecule?

Accepted Answer

It can act as both a hydrogen-bond donor and acceptor.

Question 16

The sixteenth image shows the structure of tert-butanol. What class of alcohol is this compound?

Accepted Answer

Tertiary (3°) alcohol

Question 17

The seventeenth image shows the structure of butane. Which of the following statements is true about butane?

Accepted Answer

It is a nonpolar, saturated hydrocarbon.

Question 18

The eighteenth image shows the structure of propanal. Which functional group is present in this molecule?

Accepted Answer

Aldehyde

Question 19

The nineteenth image shows the structure of ethyl methyl ether. Which of the following statements is true about this molecule?

Accepted Answer

It is an ether and can act as a hydrogen-bond acceptor but not a donor.

Question 20

The twentieth image shows the structure of acetaldehyde. Which of the following statements is true about this molecule?

Accepted Answer

It is an aldehyde and can be oxidized to a carboxylic acid.

UM BIO Exam 1: Practice with Molecular Structure, Isomerism, and Functional Groups

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