In which molecule is the bond angle closest to 120°?

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Question: In which molecule is the bond angle closest to 120°?

Options:

Correct Answer: BF3

Solution:

BF3 has a trigonal planar geometry with bond angles of approximately 120°.

In which molecule is the bond angle closest to 120°?

In which molecule is the bond angle closest to 120°?

Step 1: Understand what a bond angle is. A bond angle is the angle between two bonds that connect to the same atom.
Step 2: Learn about molecular geometry. Different shapes of molecules have different bond angles.
Step 3: Identify the geometry of BF3 (Boron Trifluoride). BF3 has three bonds and no lone pairs on the central atom (Boron).
Step 4: Recognize that BF3 has a trigonal planar shape. This means the three bonds are spread out evenly around the central atom.
Step 5: Know that in a trigonal planar geometry, the bond angles are approximately 120°.
Step 6: Compare BF3 with other molecules to see if they have bond angles close to 120°. Most other common molecules with three bonds have different angles.

Molecular Geometry – Understanding the shapes of molecules based on VSEPR theory, which predicts bond angles based on electron pair repulsion.
Bond Angles – Knowledge of specific bond angles associated with different molecular geometries, such as trigonal planar (120°).