Question 1

Which experiment disproved the theory of vitalism in organic chemistry, and what was its significance?

Accepted Answer

The conversion of ammonium cyanate to urea by Wöhler, demonstrating that an organic compound can be synthesized from inorganic materials.

Question 2

Which of the following best describes the difference between ionic and covalent bonding?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, resulting in oppositely charged ions, while covalent bonds involve the sharing of electrons between atoms.

Question 3

Given the electronic configuration $$1s^2$$ $$2s^2$$ $$2p^2$$, how many valence electrons does a carbon atom have?

Accepted Answer

4

Question 4

Which of the following statements about the 2p orbitals is correct?

Accepted Answer

There are three 2p orbitals, each consisting of two lobes and oriented along the x, y, and z axes.

Question 5

Which of the following molecules contains a polar covalent bond?

Accepted Answer

$$\mathrm{CH_3Cl}$$

Question 6

What is the formal charge on the oxygen atom in the hydronium ion ($$\mathrm{H_3O^+}$$)?

Accepted Answer

+1

Question 7

Which of the following is the correct condensed structural formula for isopropyl alcohol?

Accepted Answer

$$\mathrm{(CH_3$)_2CHOH}$$

Question 8

Which of the following criteria is most important when determining the major resonance contributor for a molecule?

Accepted Answer

The structure in which all atoms have complete octets.

Question 9

What is the bond angle in a molecule with sp$$^3$$ hybridization, such as methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

$$109.5^\circ$$

Question 10

Which of the following best explains why rotation around a double bond is restricted?

Accepted Answer

Double bonds consist of a sigma bond and a pi bond; the pi bond results from the sideways overlap of p orbitals, which prevents rotation.

Question 11

Which of the following is a constitutional (structural) isomer of ethanol ($$\mathrm{CH_3CH_2OH}$$)?

Accepted Answer

$$\mathrm{CH_3OCH_3}$$

Question 12

Which of the following statements about resonance is FALSE?

Accepted Answer

Resonance forms with the most charge separation are always the most stable.

Question 13

Which of the following best describes the molecular geometry of borane ($$\mathrm{BH_3$}$$)?

Accepted Answer

Trigonal planar, with bond angles of $$120^\circ$$

Question 14

Which of the following is the empirical formula for a compound with the molecular formula $$\mathrm{C_2H_4O_2}$$?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 15

Which of the following statements about hybridization is correct?

Accepted Answer

sp hybridization results in a linear geometry with $$180^\circ$$ bond angles.

Question 16

Which of the following molecules can exhibit cis-trans (geometric) isomerism?

Accepted Answer

$$\mathrm{CHF=CHF}$$

Question 17

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

Accepted Answer

A sigma bond is formed by the end-to-end overlap of orbitals along the internuclear axis, while a pi bond is formed by the sideways overlap of parallel p orbitals.

Question 18

Which of the following best explains why the C–H bond is considered nonpolar?

Accepted Answer

Carbon and hydrogen have similar electronegativities.

Question 19

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

Accepted Answer

$$	ext{Formal charge} = 	ext{group number} - 	ext{nonbonding electrons} - \frac{1}{2}(	ext{shared electrons})$$

Chapter 1: Structure and Bonding – Foundations of Organic Chemistry

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