Q: Which of the following is the correct formula for calculating the formal charge on an atom?

$$\\text{Formal charge} = \\text{number of valence electrons} - (\\text{number of lone pair electrons} + \\frac{1}{2} \\times \\text{number of bonding electrons})$$

Question 1

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Azimuthal quantum number ($$l)$$

Question 2

What is the hybridization of the central carbon atom in ethene ($$C_2H_4$$)?

Accepted Answer

$$sp^2$$

Question 3

Which of the following best describes a $$\sigma$$ bond?

Accepted Answer

A bond formed by the end-to-end overlap of orbitals

Question 4

Which of the following molecules contains a triple bond?

Accepted Answer

Ethyne ($$C_2H_2)$$

Question 5

What is the formal charge on the oxygen atom in the hydroxide ion ($$OH^-$$)?

Accepted Answer

$$-1$$

Question 6

Which of the following statements about resonance structures is correct?

Accepted Answer

The actual molecule is a hybrid of all resonance forms

Question 7

Which of the following is the strongest acid?

Accepted Answer

Acetic acid ($$CH_3COOH)$$

Question 8

What is the IUPAC name for the following compound: $$CH_3CH_2CH_2CH_3$$?

Accepted Answer

Butane

Question 9

Which of the following is a correct statement about nucleophiles?

Accepted Answer

Nucleophiles are electron pair donors

Question 10

Which of the following is the correct general formula for cycloalkanes?

Accepted Answer

$$C_nH_{2n}$$

Question 11

Which conformation of butane has the lowest energy?

Accepted Answer

Anti

Question 12

What is the major product when 2-methylpropane reacts with chlorine under UV light?

Accepted Answer

2-chloro-2-methylpropane

Question 13

Which of the following is a correct statement about the stability of carbocations?

Accepted Answer

Tertiary carbocations are more stable than secondary carbocations

Question 14

Which of the following is the correct order of acidity for the following compounds: $$CH_4$$, $$NH_3$$, $$H_2O$$, $$HF$$?

Accepted Answer

$$CH_4$$ \u003c $$NH_3$$ \u003c H_2O \u003c HF$$

Question 15

Which of the following is a correct statement about the energy diagram of a reaction?

Accepted Answer

The activation energy is the difference between the reactants and the transition state

Question 16

Which of the following is the correct IUPAC name for the compound with the structure $$CH_3CH_2CH(CH_3$)CH_2CH_3$$?

Accepted Answer

3-methylpentane

Question 17

Which of the following statements about the chair conformation of cyclohexane is correct?

Accepted Answer

The chair conformation is the most stable conformation

Question 18

Which of the following is a correct statement about the effect of resonance on acidity?

Accepted Answer

Resonance increases the acidity by stabilizing the conjugate base

Question 19

Which of the following is the correct formula for calculating the formal charge on an atom?

Accepted Answer

$$\text{Formal charge} = \text{number of valence electrons} - (\text{number of lone pair electrons} + \frac{1}{2} \times \text{number of bonding electrons})$$

Question 20

Which of the following is the correct relationship between $$K_{eq}$$ and $$\Delta G^\circ$$?

Accepted Answer

$$\Delta G^\circ = -RT \ln K_{eq}$$

Organic Chemistry: Structure, Bonding, Acids & Bases, and Alkanes

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