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

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

Give five examples of structures with this formula (C₆H₁₂). At least one should contain a ring, and at least one should contain a double bond.

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

C = number of carbons

H = number of hydrogens

Determine the number of elements of unsaturation in the molecular formula C₄H₆. Give all nine possible structures having this formula. Remember that

a double bond = one element of unsaturation

a ring = one element of unsaturation

a triple bond = two elements of unsaturation

Draw five more compounds of formula C₄H₆NOCl.

For each of the following molecular formulas, determine the number of elements of unsaturation, and draw three examples.

a. C₄H₄Cl₂

b. C₄H₈O

c. C₆H₈O₂

For each of the following molecular formulas, determine the number of elements of unsaturation, and draw three examples. 

d. C₅H₅NO₂

e. C₆H₃NClBr