When Applying VSEPR Theory to Determine the Geometry About a Central

question 20

Multiple Choice

When applying VSEPR theory to determine the geometry about a central atom,it is important to count the number of electron groups.Separately consider the two atoms highlighted with an arrow in the molecule shown below.How many electron groups must be considered for each of these central atoms?

• A)C₁ has two groups; C₂ has two groups.
• B)C₁ has three groups; C₂ has four groups.
• C)C₁ has four groups; C₂ has two groups.
• D)C₁ has four groups; C₂ has three groups.
• E)C₁ has four groups; C₂ has four groups.

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Definitions:

Innate Immunity

The body's first line of defense against infection that includes physical barriers, immune cells, and proteins, responding to pathogens in a generic way.

Helper T Cells

A type of T cell that plays a critical role in the immune response by activating and directing other immune cells.

Phagocytosis

The process by which cells, particularly immune cells, engulf and digest large particles or microorganisms.

MHC Class II

Molecules present on immune cells that present antigens to helper T cells, crucial for initiating immune responses.