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What is the hybridization state and molecular geometry around the carbon atom in the molecule shown in the box?

Which of the following Lewis structures is correct?  

What is the ground-state electronic configuration of a chlorine anion (Cl—)?

What is the electronic configuration for the oxide ion?

Bonus question For the following reaction identify the acid and the base and predict the products.

What is the order of decreasing bond length for a C-C bond composed of the following molecular orbitals? 

For the following reaction identify the acid, base, conjugate acid and conjugate base.

Which of the following structures have carbon with sp2 hybridization state?

For the following reaction, respectively identify the Brønsted-Lowry base and the conjugate acid.

Which of the indicated protons is most acidic?