$$sp^3d$ hybrid of S$$\ \text{and}\ 2p$$ of F

Question 1

According to VSEPR theory, what is the electron geometry and ideal bond angle for a molecule with four electron groups around the central atom?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 2

Which of the following statements best explains why lone pairs occupy more space than bonding pairs in VSEPR theory?

Accepted Answer

Lone pairs are localized on the central atom, leading to greater electron density and repulsion.

Question 3

What is the molecular geometry and approximate bond angle of ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Trigonal pyramidal, $$\u003c109.5^\circ$$

Question 4

Which hybridization scheme is associated with a central atom that has three electron groups?

Accepted Answer

$$sp^2$$

Question 5

A molecule of $$\mathrm{CO_2$}$$ has which of the following properties?

Accepted Answer

Linear geometry, nonpolar molecule

Question 6

Which of the following molecules is expected to have a net dipole moment?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 7

What is the hybridization of the central atom in $$\mathrm{SF_6$}$$?

Accepted Answer

$$sp^3d^2$

Question 8

Which of the following best describes the bonding in ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

Each carbon is $$sp^2$$ hybridized, with one sigma and one pi bond between the carbons.

Question 9

Which of the following molecules has a square planar molecular geometry?

Accepted Answer

$$\mathrm{$$XeF_4$$}$$

Question 10

Which of the following statements about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

A triple bond consists of one sigma and two pi bonds.

Question 11

What is the expected bond angle in a molecule with a trigonal bipyramidal electron geometry between an axial and an equatorial position?

Accepted Answer

$$90^\circ$$

Question 12

Which of the following best explains why $$\mathrm{H_2O}$$ has a bond angle less than $$109.5^\circ$$?

Accepted Answer

The presence of two lone pairs on oxygen increases repulsion, compressing the bond angle.

Question 13

Which of the following hybridization schemes allows the formation of at least one $$\pi$$ bond?

Accepted Answer

$$sp^2$$

Question 14

In the molecule $$\mathrm{CH_2O} ($$formaldehyde), what is the hybridization of the central carbon atom?

Accepted Answer

$$sp^2$$

Question 15

Which of the following is a limitation of VSEPR theory?

Accepted Answer

It cannot predict the existence of resonance structures.

Question 16

Which of the following best describes the geometry around the central atom in $$\mathrm{$$PCl_5$$}$$?

Accepted Answer

Trigonal bipyramidal

Question 17

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

Accepted Answer

$$\mathrm{CO_2$}$$

Question 18

Which of the following best describes the bond rotation in a double bond?

Accepted Answer

Rotation is restricted due to the presence of a $$\pi$$ bond.

Question 19

What is the hybridization of the central atom in $$\mathrm{$$XeF_2$$}$$?

Accepted Answer

$$sp^3d$

Question 20

Which orbitals overlap to form the sigma bond between sulfur and fluorine in $$\mathrm{SF_4$}$$?

Accepted Answer

$$sp^3d$ hybrid of S$$\ 	ext{and}\ 2p$$ of F

Shapes and Bonding Theories: VSEPR, Molecular Geometry, and Valence Bond Theory

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