Question 1

Which statement best describes the difference between an ionic and a covalent bond?

Accepted Answer

Ionic bonds result from the transfer of electrons from one atom to another, while covalent bonds result from the sharing of electrons between two atoms.

Question 2

What is the formal charge on the oxygen atom in the hydroxide ion ($$\mathrm{OH^-}$$)?

Accepted Answer

$$-1$$

Question 3

Which of the following molecules is a constitutional isomer of ethanol ($$\mathrm{C_2H_6O}$$)?

Accepted Answer

Dimethyl ether ($$\mathrm{CH_3OCH_3})$$

Question 4

Which of the following statements about resonance structures is TRUE?

Accepted Answer

The resonance hybrid is a composite of all possible resonance forms and represents the actual molecule.

Question 5

What is the predicted geometry and bond angle around a carbon atom with three groups attached?

Accepted Answer

Trigonal planar, $$120^\circ$$

Question 6

Which of the following best explains why rotation around a carbon-carbon double bond ($$\mathrm{C=C}) $$does NOT occur at room temperature?

Accepted Answer

The $$\pi$$ bond must be broken to allow rotation, which requires significant energy.

Question 7

How many valence electrons does a neutral nitrogen atom have?

Accepted Answer

5

Question 8

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 9

What is the hybridization of the central carbon atom in acetylene ($$\mathrm{C_2H_2}$$)?

Accepted Answer

$$sp$$

Question 10

Which of the following best describes the bond polarity in a $$\mathrm{C-O}$$ bond?

Accepted Answer

Polar, with oxygen being electron rich and carbon being electron deficient.

Question 11

A molecule has four groups attached to a central atom, including one lone pair. What is its molecular shape?

Accepted Answer

Trigonal pyramidal

Question 12

Which of the following is TRUE about the bond strength and bond length of single, double, and triple carbon-carbon bonds?

Accepted Answer

Triple bonds are the shortest and strongest.

Question 13

What is the correct condensed structure for ethylene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

$$\mathrm{CH_2$=CH_2$}$$

Question 14

Which of the following is NOT a valid resonance structure for a molecule containing only second-row elements?

Accepted Answer

A structure with a second-row element having more than eight electrons.

Question 15

What is the number of $$\pi$$ bonds in the molecule acetylene ($$\mathrm{C_2H_2}$$)?

Accepted Answer

2

Question 16

Which of the following best describes the electron configuration of carbon in its ground state?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^2$$

Question 17

Which of the following statements about lone pairs is correct?

Accepted Answer

Lone pairs are nonbonded electrons that can affect molecular geometry.

Question 18

What is the maximum number of electrons that can occupy the second shell of an atom?

Accepted Answer

8

Question 19

Which of the following best explains why water ($$\mathrm{H_2O}) is a $$polar molecule?

Accepted Answer

It has two polar bonds that reinforce each other due to its bent geometry.

Question 20

Which type of orbital overlap forms a $$\sigma$$ bond in methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Overlap of $$sp^3$$ hybrid orbital on carbon with $$1s$$ orbital on hydrogen.

Organic Chemistry: Structure and Bonding (Chapter 1 Study Notes)

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