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2-chlorobutane

MOLECULE: 2-Chlorobutane
[ Placeholder: Insert 2-Chlorobutane Structure ]

1. Skeleton & Packing

  • Molecular Formula: C4H9Cl
  • Degree of Unsaturation (DU): 0 (Saturated acyclic alkane)
  • Key Shapes/Rings/Chirality: Acyclic chain. One asymmetric stereocenter at C2.

2. The Physical Profile

  • Strongest IMF: Dipole-Dipole interactions
  • Water Soluble? (Yes/No): No (Fails 4:1 carbon-to-polar-group threshold; lacks H-bond donors)
  • High or Low BP/MP? Low-Moderate BP (68°C; higher than butane but lower than butanol)

3. Electronic Map

  • Polar covalent C−Cl bond creates a δ− pool on Chlorine and a δ+ deficiency on C2.
  • Identify resonance (Yes/No): No (All electrons localized in σ orbitals)
  • No acidic protons present (Alkyl pKa > 50).

4. Reactive Portfolio

  • Circle Nucleophilic sites: Chlorine lone pairs (very weak).
  • Box Electrophilic sites: The C2 carbon (bonded directly to Cl leaving group).
  • Steric Hindrance? (Low/Med/High): Medium (Secondary 2° carbon; sits at baseline junction of SN2, SN1, and E2 pathways)
5. Predicted Behavior
"This molecule acts as a secondary electrophile at C2, remaining highly vulnerable to competing substitution and elimination tracks depending on whether it encounters a strong nucleophile or a strong base."