Bond order is calculated as $$\frac{1}{2}(\text{number of bonding electrons} - \text{number of antibonding electrons})$$

Question 1

Which bonding theory best explains the resonance and delocalization observed in benzene ($$C_6H_6$$)?

Accepted Answer

Molecular Orbital (MO) theory

Question 2

What is the hybridization of the central atom in $$BF_3$$?

Accepted Answer

$$sp^2$$

Question 3

Which statement about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

$$\sigma$$ bonds are formed by head-on overlap and allow free rotation around the bond axis.

Question 4

In the molecule $$CH_4$$, what is the bond angle between the hydrogen atoms?

Accepted Answer

$$109.5^\circ$$

Question 5

How many $$\sigma$$ and $$\pi$$ bonds are present in $$C_2H_2 ($$acetylene)?

Accepted Answer

3 $$\sigma$$ bonds and 2 $$\pi$$ bonds

Question 6

Which atomic orbitals overlap to form the $$\pi$$ bond in the double bond of $$C_2H_4 ($$ethylene)?

Accepted Answer

Unhybridized $$p$$ orbitals

Question 7

What is the bond order of $$H_2$$ according to molecular orbital theory?

Accepted Answer

$$1$$

Question 8

Which molecule is predicted to be paramagnetic based on its molecular orbital diagram?

Accepted Answer

$$O_2$$

Question 9

What is the electron geometry around the central atom in $$XeF_4$$?

Accepted Answer

Octahedral

Question 10

Which hybridization corresponds to a steric number of 5?

Accepted Answer

$$sp^3d$

Question 11

In $$NH_3$$, which orbital on nitrogen contains the lone pair?

Accepted Answer

$$sp^3$$ hybrid orbital

Question 12

Which statement best describes the difference between cis and trans isomers?

Accepted Answer

Cis isomers have atoms on the same side of a double bond; trans isomers have atoms on opposite sides.

Question 13

Which of the following is a failure of the Lewis model?

Accepted Answer

Does not explain molecular shape and bond angles

Question 14

What is the hybridization of the central atom in $$AlCl_4$$^-$$?

Accepted Answer

$$sp^3$$

Question 15

Which of the following statements about hybrid orbitals is correct?

Accepted Answer

The number of hybrid orbitals formed equals the number of atomic orbitals mixed.

Question 16

In formaldehyde ($$CH_2O$$), what is the hybridization of the carbon atom?

Accepted Answer

$$sp^2$$

Question 17

Which of the following best explains why $$CH_4$$ has four equivalent bonds?

Accepted Answer

Carbon undergoes $$sp^3$$ hybridization, forming four equivalent hybrid orbitals.

Question 18

Which of the following is true about bond order in molecular orbital theory?

Accepted Answer

Bond order is calculated as $$\frac{1}{2}(	ext{number of bonding electrons} - 	ext{number of antibonding electrons})$$

Question 19

Which molecule has a central atom with $$sp^3d^2$ hybridization?

Accepted Answer

$$SF_6$$

Question 20

In $$C_2H_4 ($$ethylene), how many $$\sigma$$ and $$\pi$$ bonds are present?

Accepted Answer

5 $$\sigma$$ bonds and 1 $$\pi$$ bond

Bonding Theories, Hybridization, and Molecular Orbitals in General Chemistry

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