Question 1

Which hybridization is present in the carbon atom of methane ($$\mathrm{CH_4$}$$), and what is the expected bond angle?

Accepted Answer

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

Question 2

In ethene ($$\mathrm{C_2H_4}$$), what is the hybridization of each carbon atom and how many $$\pi$$ bonds are present?

Accepted Answer

Each carbon is $$sp^2$$ hybridized; 1 $$\pi$$ bond

Question 3

Which statement best describes the geometry and hybridization of the nitrogen atom in ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Tetrahedral electron geometry, $$sp^3$$ hybridization

Question 4

What is the percentage of s-character in the hybrid orbitals of acetylene ($$\mathrm{C_2H_2}$$)?

Accepted Answer

50%

Question 5

Which of the following molecules has a bent molecular geometry due to $$sp^3$$ hybridization?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 6

In the molecule ethyne ($$\mathrm{C_2H_2}$$), how many $$\sigma$$ and $$\pi$$ bonds are present between the two carbon atoms?

Accepted Answer

1 $$\sigma$$ bond and 2 $$\pi$$ bonds

Question 7

Which orbital remains unhybridized in $$sp^2$$ hybridization and what is its orientation?

Accepted Answer

$$2p$$ orbital, perpendicular to the plane

Question 8

What is the hybridization of the central atom in carbon dioxide ($$\mathrm{CO_2$}) $$and its molecular geometry?

Accepted Answer

$$sp$$ hybridization, linear geometry

Question 9

Which molecule contains a carbon atom with $$sp^2$$ hybridization and a trigonal planar geometry?

Accepted Answer

Ethene ($$\mathrm{C_2H_4})$$

Question 10

Which of the following statements about $$\pi$$ bonds is correct?

Accepted Answer

$$\pi$$ bonds are formed by the side-to-side overlap of unhybridized $$p$$ orbitals

Question 11

Which molecule has the highest percentage of s-character in its carbon-carbon bond?

Accepted Answer

Ethyne ($$\mathrm{C_2H_2})$$

Question 12

What is the electron geometry and molecular geometry of water ($$\mathrm{H_2O}$$)?

Accepted Answer

Tetrahedral, bent

Question 13

In benzene ($$\mathrm{C_6H_6}$$), what is the hybridization of each carbon atom and how many $$\pi$$ bonds are present?

Accepted Answer

$$sp^2$$ hybridization; 3 $$\pi$$ bonds

Question 14

Which of the following best explains why $$sp^3$$ hybridization leads to a tetrahedral geometry?

Accepted Answer

The four $$sp^3$$ orbitals are arranged to minimize electron repulsion, resulting in bond angles of $$109.5^\circ$$

Question 15

Which molecule contains a carbon atom with $$sp$$ hybridization and a triple bond?

Accepted Answer

Ethyne ($$\mathrm{C_2H_2})$$

Question 16

What is the correct electron configuration for a ground-state carbon atom?

Accepted Answer

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

Question 17

Which of the following molecules has a trigonal pyramidal molecular geometry?

Accepted Answer

Ammonia ($$\mathrm{NH_3$})$$

Question 18

Which hybridization is associated with a bond angle of approximately $$120^\circ$$?

Accepted Answer

$$sp^2$$

Question 19

In a molecule with $$sp^2$$ hybridization, how many hybrid orbitals and unhybridized $$p$$ orbitals are present on the central atom?

Accepted Answer

3 hybrid orbitals, 1 unhybridized $$p$$ orbital

Hybridization and Molecular Geometry in Organic Molecules

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