Question 1

Which of the following molecules has a central atom with sp\^2 hybridization and a bond angle closest to $$120^\circ$$? Choose the best answer.

Accepted Answer

CH\_3CHO

Question 2

Given the condensed formula CH\_3COOH, what is the total number of sigma ($$\sigma) $$and pi ($$\pi) $$bonds in the molecule?

Accepted Answer

$$8\ \sigma$$ and $$1\ \pi$$ bond

Question 3

Which of the following best describes the Lewis structure of CH\_3COCH\_3 (acetone)?

Accepted Answer

Central carbon with two single bonds and one double bond

Question 4

For the molecule HCN, what is the hybridization of the central carbon atom and the bond angle between H–C–N?

Accepted Answer

sp, $$180^\circ$$

Question 5

Which molecule below has a net dipole moment of zero?

Accepted Answer

CO\_2

Question 6

Given the molecule CH\_3CH\_2CH\_3 (propane), what is the hybridization of all carbon atoms and the approximate C–C–C bond angle?

Accepted Answer

sp\^3, $$109.5^\circ$$

Question 7

Which of the following statements about formal charge is correct for the acetate ion (CH\_3COO\^-)?

Accepted Answer

One oxygen has a formal charge of -1, the other is neutral

Question 8

In the molecule CH\_2O (formaldehyde), what is the total number of lone pairs present on the oxygen atom?

Accepted Answer

2 lone pairs

Question 9

Which molecule below contains both a trigonal planar and a tetrahedral carbon atom?

Accepted Answer

CH\_3CHO

Question 10

For the molecule CH\_3CN, what is the total number of pi ($$\pi) $$bonds present?

Accepted Answer

2 $$\pi$$ bonds

Question 11

Which of the following molecules has a central atom with a lone pair and a bond angle less than $$109.5^\circ$$?

Accepted Answer

NH\_3

Question 12

Given the molecule CH\_3CH\_2OH (ethanol), what is the hybridization of the oxygen atom?

Accepted Answer

sp\^3

Question 13

Which of the following molecules has a C=O double bond and a trigonal planar geometry at the carbonyl carbon?

Accepted Answer

CH\_3CHO

Question 14

For the molecule CH\_3COCH\_3, what is the bond angle around the central carbonyl carbon atom?

Accepted Answer

$$120^\circ$$

Question 15

Which molecule below is expected to have the largest dipole moment?

Accepted Answer

CH\_3Cl

Question 16

Given the molecule CH\_3CH\_2NH\_2 (ethylamine), what is the hybridization of the nitrogen atom?

Accepted Answer

sp\^3

Question 17

Which of the following molecules contains a triple bond?

Accepted Answer

HCN

Question 18

For the molecule CH\_3CH\_2OH, what is the total number of lone pairs present on all non-hydrogen atoms?

Accepted Answer

4 lone pairs

Question 19

Which of the following molecules has a central atom with two lone pairs and a bent geometry?

Accepted Answer

H\_2O

Question 20

Given the molecule CH\_3COOH, what is the formal charge on the oxygen atom in the hydroxyl group?

Accepted Answer

0

Fundamental Concepts in Organic Chemistry: Bonding, Lewis Structures, Hybridization, and Molecular Geometry

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