1. A Review of General Chemistry

In the context of degrees of unsaturation, a carbon-carbon triple bond contributes how many degrees of unsaturation to a molecule?

Given the molecular formula $C_6{H}_{10}$, how many degrees of unsaturation does this molecule have?

Which of the following molecules is considered unsaturated?

Given the molecular formula $C_6{H}_6$, calculate the degree of unsaturation (DU) for this molecule.

What is the index of hydrogen deficiency (degree of unsaturation) for $C_6{H}_6$?

Which of the following compounds has a degree of unsaturation equal to $2$?

Determine the degree of unsaturation and then draw possible structures for noncyclic compounds with the following molecular formulas:

b. C₃H₄

Determine the degree of unsaturation and then draw possible structures for noncyclic compounds with the following molecular formulas:

a. C₃H₆

What is the molecular formula for each of the following?

a. a 4-carbon hydrocarbon with two $\pi$ bonds and no rings

What is the molecular formula for each of the following?

b. a 10-carbon hydrocarbon with one $\pi$ bond and 2 rings

What is the molecular formula for a 5-carbon hydrocarbon with one $\pi$ bond and one ring?

If a hydrocarbon has nine carbon atoms, three double bonds, and one ring, how many hydrogen atoms must it have?

Hint: If you prefer to use a formula, elements of unsaturation = 1/2(2C + 2 - H)

C = number of carbons

H = number of hydrogens

Cholesterol, C₂₇H₄₆O, has only one pi bond. With no additional information, what else can you say about its structure?

Calculate the number of elements of unsaturation implied by the molecular ­formula C₆H₁₂.

Hint: If you prefer to use a formula, elements of unsaturation = 1/2(2C + 2 - H)

C = number of carbons

H = number of hydrogens