Question 1

Which of the following statements best explains why the shape of a molecule is important for its biological activity?

Accepted Answer

The shape allows the molecule to fit and interact specifically with biological targets, such as enzymes or receptors.

Question 2

According to the VSEPR model, what is the electron geometry around a central atom with three electron groups?

Accepted Answer

Trigonal planar

Question 3

A molecule has the formula $$\mathrm{AB_2$}$$ and the central atom has one lone pair and two bonding pairs. What is the molecular geometry and approximate bond angle?

Accepted Answer

Bent, $$\u003c120^\circ$$

Question 4

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

Accepted Answer

$$\mathrm{CO_2$}$$

Question 5

What is the hybridization of the central atom in $$\mathrm{NH_3$}$$?

Accepted Answer

$$sp^3$$

Question 6

Which of the following best describes the difference between a bonding and an antibonding molecular orbital?

Accepted Answer

Bonding orbitals result from constructive interference of atomic orbitals, while antibonding orbitals result from destructive interference.

Question 7

A molecule has five electron groups around its central atom, including one lone pair. What is its electron geometry and molecular geometry?

Accepted Answer

Trigonal bipyramidal; seesaw

Question 8

Which of the following molecules is expected to be paramagnetic according to molecular orbital theory?

Accepted Answer

$$\mathrm{O_2$}$$

Question 9

What is the bond order of $$\mathrm{N_2$}$$ according to molecular orbital theory?

Accepted Answer

$$3$$

Question 10

Which hybridization is associated with a central atom that forms a linear geometry?

Accepted Answer

$$sp$$

Question 11

A molecule of $$\mathrm{SF_4$}$$ has five electron groups around the central atom, one of which is a lone pair. What is the expected molecular geometry?

Accepted Answer

Seesaw

Question 12

Which of the following is true about the number of molecular orbitals formed from atomic orbitals?

Accepted Answer

The number of molecular orbitals equals the number of atomic orbitals combined.

Question 13

Which of the following molecules is polar due to both bond polarity and molecular geometry?

Accepted Answer

$$\mathrm{H_2O}$$

Question 14

What is the hybridization of the central atom in $$\mathrm{$$PCl_5$$}$$?

Accepted Answer

$$sp^3d$

Question 15

Which of the following best describes the process of hybridization in valence bond theory?

Accepted Answer

Atomic orbitals mix to form new hybrid orbitals with different shapes and energies.

Question 16

A molecule has six electron groups around its central atom, two of which are lone pairs. What is its molecular geometry?

Accepted Answer

Square planar

Question 17

Which of the following is a consequence of delocalized electrons in resonance structures?

Accepted Answer

Increased molecular stability due to electron delocalization.

Question 18

What is the bond order of $$\mathrm{CN^-}$$ according to molecular orbital theory?

Accepted Answer

$$3$$

Question 19

Which of the following statements about molecular orbital theory is correct?

Accepted Answer

It explains the magnetic properties of molecules by considering electron pairing in molecular orbitals.

Question 20

Which of the following molecules has a bond angle closest to $$109.5^\circ$$?

Accepted Answer

$$\mathrm{CH_4$}$$

Bonding Theories: Explaining Molecular Geometry (Chapter 5 Study Notes)

Guida di studio - Domande di pratica

Study guide - Flashcard