ChemistryOrganic Chemistry

Degrees of Unsaturation Formula: Find Missing Hydrogen Counts

Use ring and double-bond counts to find the missing hydrogens in three molecular formulas, then check each result with DBE.

Question

Find the number of hydrogen atoms in each compound described below.

(a) C₈H?O₂: two rings and one double bond (b) C₇H?N: two double bonds (c) C₉H?NO: one ring and three double bonds

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Evidence boundary

The three formula skeletons and ring/double-bond counts are from OpenStax Organic Chemistry Problem 7-35. Hydrogen counts are calculated here for neutral compounds with ordinary carbon, nitrogen, oxygen, and hydrogen valences. No particular molecular structure or isomer is inferred.