Question 1

Which experiment by Friedrich Wöhler in 1828 challenged the concept of 'vital force' in organic chemistry?

Accepted Answer

He converted ammonium cyanate into urea, demonstrating that organic compounds could be made from inorganic substances.

Question 2

Which statement best describes the difference between organic and inorganic compounds according to early chemists?

Accepted Answer

Organic compounds were thought to require a 'vital force' for their synthesis, unlike inorganic compounds.

Question 3

What is the atomic number ($$Z) of an $$element?

Accepted Answer

The number of protons in the atom's nucleus.

Question 4

Which of the following is an isotope of hydrogen?

Accepted Answer

Deuterium ($$^2\mathrm{H})$$

Question 5

According to the octet rule, atoms are most stable when:

Accepted Answer

They have a filled or empty outer layer of electrons.

Question 6

Which principle states that electrons fill the lowest-energy orbitals first?

Accepted Answer

Aufbau principle

Question 7

What is the maximum number of electrons that can occupy a single orbital?

Accepted Answer

Two

Question 8

Which of the following electron configurations correctly follows the Aufbau principle for the first 10 elements?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 9

Which statement about p orbitals is correct?

Accepted Answer

The lobes of a p orbital are separated by a region of zero electron density called a node.

Question 10

Which of the following elements is the most electronegative?

Accepted Answer

Fluorine

Question 11

What type of bond is formed when electrons are transferred from a metal to a nonmetal?

Accepted Answer

Ionic bond

Question 12

Which of the following molecules is correctly represented by a Lewis structure showing only the valence electrons?

Accepted Answer

H$$_2$$

Question 13

Which rule explains why electrons in degenerate orbitals (orbitals of equal energy) will occupy separate orbitals before pairing up?

Accepted Answer

Hund's rule

Question 14

Which of the following best describes the electron cloud model?

Accepted Answer

Electrons exist in a cloud of probability, with no specific boundary.

Question 15

Which of the following elements has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^1$$?

Accepted Answer

Sodium (Na)

Question 16

Which of the following statements about shells and orbitals is correct?

Accepted Answer

The second shell contains one s orbital and three p orbitals, for a total of 8 electrons.

Question 17

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes are atoms of the same element with different numbers of neutrons.

Question 18

Which of the following best explains why carbon is central to organic chemistry?

Accepted Answer

Carbon has four valence electrons and can form four covalent bonds.

Question 19

Which of the following is the correct electron configuration for magnesium ($$Z=12$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$

Question 20

Which of the following statements about electronegativity trends in the periodic table is correct?

Accepted Answer

Electronegativity increases from left to right and from bottom to top.

Foundations of Organic Chemistry: Atomic Structure, Bonding, and Electron Configuration

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