Question 1

Which of the following statements best explains why ethanol and dimethyl ether have significantly different boiling points, despite having the same molecular formula ($$\mathrm{C_2H_6O}$$)?

Accepted Answer

Ethanol forms hydrogen bonds, while dimethyl ether cannot, resulting in a higher boiling point for ethanol.

Question 2

Given the molecular formula $$\mathrm{C_3H_8O}$$, which of the following is a constitutional isomer of 1-propanol?

Accepted Answer

2-propanol

Question 3

Which atom is the most electronegative among the following?

Accepted Answer

Fluorine ($$\mathrm{F})$$

Question 4

What is the formal charge on the oxygen atom in a hydroxide ion ($$\mathrm{OH^-}$$)?

Accepted Answer

$$-1$$

Question 5

Which type of bond is formed by the side-by-side overlap of unhybridized p orbitals?

Accepted Answer

Pi ($$\pi) $$bond

Question 6

A carbon atom in methane ($$\mathrm{CH_4$}) $$has a steric number of 4. What is its hybridization and molecular geometry?

Accepted Answer

sp$$^3$$ hybridization; tetrahedral geometry

Question 7

Which intermolecular force is primarily responsible for the high boiling point of water ($$\mathrm{H_2O}$$)?

Accepted Answer

Hydrogen bonding

Question 8

Which of the following molecules will have the shortest carbon-carbon bond length?

Accepted Answer

Acetylene ($$\mathrm{C_2H_2})$$

Question 9

Which of the following best describes the effect of branching on the boiling point of organic molecules?

Accepted Answer

Increased branching decreases surface area, leading to a lower boiling point due to weaker London dispersion forces.

Question 10

Which of the following solvents is considered aprotic?

Accepted Answer

Diethyl ether

Question 11

What is the molecular geometry around the central atom in $$\mathrm{BF_3$}$$?

Accepted Answer

Trigonal planar

Question 12

Which of the following statements about London dispersion forces is correct?

Accepted Answer

They are present in all molecules, but are the only intermolecular force in nonpolar molecules.

Question 13

Which of the following molecules is most likely to be soluble in water?

Accepted Answer

Methanol ($$\mathrm{CH_3OH})$$

Question 14

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 head-on overlap of orbitals, while a pi bond is formed by side-by-side overlap of p orbitals.

Question 15

Which of the following molecules contains a carbon atom with sp hybridization?

Accepted Answer

Acetylene ($$\mathrm{C_2H_2})$$

Question 16

Which of the following is the correct formula for calculating a dipole moment ($$\mu$$)?

Accepted Answer

$$\mu = q 	imes d$$

Question 17

Which of the following best explains why soap molecules can remove nonpolar dirt from clothes when mixed with water?

Accepted Answer

Soap molecules form micelles with a nonpolar interior that traps dirt, while the polar exterior interacts with water.

Question 18

Which of the following molecules will have the highest boiling point?

Accepted Answer

3-Hexanol

Question 19

What is the steric number and hybridization of the central atom in $$\mathrm{CO_2$}$$?

Accepted Answer

Steric number = 2; sp hybridization

Organic Chemistry Chapter 1: Review of General Chemistry – Electrons, Bonds, and Molecular Properties

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