Question 1

Which molecular geometry is represented by three electron groups around a central atom, all of which are bonding pairs, and what is the ideal bond angle?

Accepted Answer

Trigonal planar, $$120^\circ$$

Question 2

A molecule has four electron groups around its central atom, with one group being a lone pair. What is the molecular geometry and the approximate bond angle?

Accepted Answer

Trigonal pyramidal, $$107^\circ$$

Question 3

Which of the following molecules is nonpolar, despite having polar bonds, due to its symmetrical tetrahedral shape?

Accepted Answer

CCl4

Question 4

What is the hybridization of the central atom in SF6, and what is its electron geometry?

Accepted Answer

sp3d2, octahedral

Question 5

Which statement best explains why the bond angle in water ($$\ce{H2O}) is $$less than the ideal tetrahedral angle?

Accepted Answer

The presence of two lone pairs increases repulsion, compressing the bond angle to $$104.5^\circ$$

Question 6

Which molecular geometry results when there are five electron groups around a central atom, with one group being a lone pair?

Accepted Answer

Seesaw

Question 7

In the molecule acetone, $$(\ce{(CH3)2CO})$$, what is the hybridization of the central carbon atom in the $$\ce{CO}$$ group?

Accepted Answer

sp2

Question 8

Which of the following best describes the bonding in ethylene ($$\ce{C2H4}$$)?

Accepted Answer

Each carbon is sp2 hybridized, forming one sigma and one pi bond between the carbons

Question 9

A molecule has six electron groups around its central atom, with two groups being lone pairs. What is the molecular geometry?

Accepted Answer

Square planar

Question 10

Which of the following molecules is polar due to its molecular geometry, even though it has polar bonds?

Accepted Answer

CHCl3

Question 11

What is the bond angle in a molecule with a trigonal bipyramidal electron geometry and no lone pairs?

Accepted Answer

$$90^\circ$$ and $$120^\circ$$

Question 12

Which hybridization scheme is used for the central atom in $$\ce{BeCl2}$$, and what is the resulting geometry?

Accepted Answer

sp, linear

Question 13

Which of the following best describes the difference between sigma ($$\sigma) $$and pi ($$\pi) $$bonds?

Accepted Answer

Sigma bonds are formed by end-to-end overlap, pi bonds by sideways overlap

Question 14

Which molecule has a bent geometry due to the presence of two lone pairs on the central atom?

Accepted Answer

H2O

Question 15

What is the electron geometry and hybridization of the central atom in $$\ce{PF6^-}$$?

Accepted Answer

Octahedral, sp3d2

Question 16

Which of the following molecules has a T-shaped molecular geometry?

Accepted Answer

BrF3

Question 17

A molecule has three electron groups: one lone pair, one single bond, and one double bond. What is the electron geometry around the central atom?

Accepted Answer

Trigonal planar

Question 18

Which of the following best describes the molecular geometry of $$\ce{ClO2F}$$, given that the central atom has four electron groups (three bonding, one lone pair)?

Accepted Answer

Trigonal pyramidal

Question 19

Which molecule is nonpolar because its bond dipoles cancel due to its linear geometry?

Accepted Answer

CO2

Question 20

What is the hybridization of the oxygen atom in methanol ($$\ce{CH3OH}$$)?

Accepted Answer

sp3

Molecular Shapes, VSEPR Theory, and Hybridization: A Study Guide

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