Question 1

Which of the following best describes the difference between an expanded structural formula and a skeletal formula for organic molecules?

Accepted Answer

An expanded structural formula shows all atoms and bonds explicitly, while a skeletal formula omits hydrogen atoms bonded to carbons and represents carbon atoms as vertices.

Question 2

How many $$\pi-$$bonds are present in the molecule shown in the second image?

Accepted Answer

3

Question 3

In the molecule $$\mathrm{CH_3CH_2C(CH_3$)_2CH_2OH}$$, how many tertiary carbons are present?

Accepted Answer

1

Question 4

Which of the following is the correct skeletal structure for $$\mathrm{CH_3CH_2C(CH_3$)_2CH_2OH}$$?

Accepted Answer

A four-carbon chain with two methyl groups on the third carbon and an OH group on the fourth carbon.

Question 5

How many hydrogen atoms are attached to the second carbon in the molecule $$\mathrm{CH_3CH_2C(CH_3$)_2CH_2OH}$$?

Accepted Answer

2

Question 6

Which of the following statements about line (skeletal) structures is correct?

Accepted Answer

Each vertex represents a carbon atom, and hydrogen atoms attached to carbons are usually omitted.

Question 7

Given the molecule in the second image, what is the hybridization of the carbon atom bonded to the amino group ($$\mathrm{NH_2$}$$)?

Accepted Answer

$$sp^2$$

Question 8

Which of the following best describes the condensed structural formula for pentane?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$

Question 9

How many carbon atoms are present in the skeletal formula shown in the first image?

Accepted Answer

5

Question 10

Which of the following molecules contains a triple bond?

Accepted Answer

The molecule in the second image

Question 11

What is the IUPAC name for the molecule $$\mathrm{CH_3CH_2C(CH_3$)_2CH_2OH}$$?

Accepted Answer

2,2-Dimethyl-4-pentanol

Question 12

Which of the following best describes the number of $$\pi-$$bonds in a molecule with one double bond and one triple bond?

Accepted Answer

3

Question 13

In the skeletal structure of 1-sec-butyl-2-isopropylcyclopentane, how many carbon atoms are present in total?

Accepted Answer

11

Question 14

Which of the following is true about the representation of hydrogen atoms in skeletal structures?

Accepted Answer

Hydrogen atoms bonded to carbons are usually omitted.

Question 15

Which of the following best describes the functional groups present in the molecule shown in the second image?

Accepted Answer

Amine, alkene, alkyne, and ether

Organic Chemistry Drawing and Structure Practice

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