Organic Compounds Alkanes

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Organic Compounds Alkanes

Skeletal Formula B.3 Cycloalkanes Compound Condensed Structural Formula 1. Cyclopentane 2. Cyclohexane B.4 Haloalkanes Compound Expanded Structural Formula Condensed Structural Formula 1. Chloromethane 2. 1,2-Dibromoethane 3. 2-Iodopropane Isomers of Cich Organic Compounds: Alkanes 3.3 Cycloalkanes Compound Condensed Structural Formula Skeletal Formula 1. Cyclopentane 2. Cyclohexane 4 Haloalkanes Compound Expanded Structural Formula Condensed Structural Formula 1. Chloromethane 2. 1,2-Dibromoethane 3. 2-Iodopropane somers of Ch.ch

The Correct Answer and Explanation is :

Organic Compounds and Their Formulas:

B.3 Cycloalkanes

  1. Cyclopentane (C₅H₁₀)
  • Condensed Structural Formula: C₅H₁₀
  • Skeletal Formula:
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   /  \
   \  /
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  • Explanation: Cyclopentane is a five-membered ring where all carbon atoms are connected to two hydrogen atoms each (except for the two terminal carbon atoms in a ring). The bond angles in cyclopentane deviate from the tetrahedral angle of 109.5° because the ring must bend to accommodate the geometry. This bending introduces some strain into the structure, but cyclopentane is still a relatively stable compound.
  1. Cyclohexane (C₆H₁₂)
  • Condensed Structural Formula: C₆H₁₂
  • Skeletal Formula:
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       /  \
      /    \
     |      |
      \    /
       \__/
  • Explanation: Cyclohexane is a six-membered ring where each carbon is bonded to two hydrogens. Cyclohexane’s structure can adopt different conformations, such as the “chair” and “boat” forms, which help reduce strain in the molecule. The chair conformation is the most stable and allows the molecule to avoid torsional strain, leading to lower energy.

B.4 Haloalkanes

  1. Chloromethane (CH₃Cl)
  • Expanded Structural Formula: CH₃—Cl
  • Condensed Structural Formula: CH₃Cl
  • Explanation: Chloromethane consists of a methyl group (CH₃) bonded to a chlorine atom. It is a simple haloalkane, and the carbon atom in the methyl group is bonded to three hydrogen atoms and one chlorine atom. Chloromethane is a commonly used solvent and refrigerant.
  1. 1,2-Dibromoethane (C₂H₄Br₂)
  • Expanded Structural Formula: CH₂Br—CH₂Br
  • Condensed Structural Formula: CH₂BrCH₂Br
  • Explanation: 1,2-Dibromoethane is an ethane molecule with bromine atoms attached to the first and second carbon atoms. It is used in chemical synthesis and as a fumigant.
  1. 2-Iodopropane (C₃H₇I)
  • Expanded Structural Formula: CH₃—CH(I)—CH₃
  • Condensed Structural Formula: CH₃CH(I)CH₃
  • Explanation: 2-Iodopropane is an isomer of propyl iodide with an iodine atom attached to the second carbon in the propyl chain. It is often used as a halogenating agent in organic chemistry.

Isomers of Cycloalkanes

  • The isomers of cycloalkanes refer to the different possible structures that can be formed by cycloalkanes based on the arrangement of their carbon atoms in a ring. For example, cyclohexane and its different conformers (like chair and boat forms) or possible substitutions could lead to several isomeric forms with different physical and chemical properties.

Explanation of the Answer:

These compounds are part of two major classes of organic molecules: cycloalkanes and haloalkanes. Cycloalkanes are characterized by their cyclic structure, whereas haloalkanes contain halogen atoms (such as chlorine, bromine, or iodine) attached to carbon atoms in a hydrocarbon chain. The molecular formulas and structural representations (condensed and skeletal) are essential for understanding the chemical bonding and stability of these compounds, as well as how they can interact with other molecules in chemical reactions. Each compound shows specific bonding patterns that affect its reactivity and physical properties.

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