Organic chemistryLesson 1 of 3 in the course Organic Chemistry

Hydrocarbons: Structure, Isomerism, Naming, and Reactions

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

This lesson introduces hydrocarbons and explains how carbon’s bonding ability creates many different structures. It focuses on alkanes, their three-dimensional shape, structural formulas, and general formula.

Hydrocarbons are organic compounds made only of carbon and hydrogen. Carbon atoms can form up to four strong covalent bonds, including bonds to other carbon atoms. This allows carbon to form chains, branched chains, and rings of many sizes.

All flashcards

What is a hydrocarbon?
An organic compound composed only of carbon and hydrogen atoms.
What makes an alkane saturated?
It contains only single carbon-carbon bonds, with no carbon-carbon double or triple bonds.
What geometry is associated with an sp³-hybridized alkane carbon?
A roughly tetrahedral arrangement with bond angles close to 109.5°.
What is the general formula for a noncyclic alkane?
CnH2n+2C_nH_{2n+2}, where nn is the number of carbon atoms.
What are structural isomers?
Compounds with the same molecular formula but different connectivity of atoms, such as n-butane and 2-methylpropane.

Quiz questions

  1. What elements are present in a hydrocarbon?Answer: Carbon and hydrogen only.
  2. What type of carbon-carbon bonds occur in an alkane?Answer: Single covalent bonds only.
  3. What is the usual hybridization and approximate bond angle around an alkane carbon?Answer: sp³ hybridization and about 109.5°.
  4. In a skeletal structure, what does each bend or line end represent?Answer: A carbon atom.
  5. What is the molecular formula of a noncyclic alkane containing six carbon atoms?Answer: C6H14C_6H_{14}.

Based on Chemistry 2e by Paul Flowers, Klaus Theopold, Richard Langley, William R. Robinson, PhD (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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