Why do haloalkenes under go nucleophillic substitution whereas haloarenes under go electophillic substitution

Explanation

To understand why haloalkenes undergo nucleophilic substitution while haloarenes undergo electrophilic substitution, we can break down the concepts step by step.

### Step 1: Understanding Haloalkenes
Haloalkenes are compounds that contain a carbon-carbon double bond (alkene) along with a halogen atom (e.g., Cl, Br). For example, consider the compound CH2=CH-CH2Cl (Chloroalkene).

**Explanation:**
- In haloalkenes, the carbon atom bonded to the halogen is sp² hybridized and has a partial positive charge due to the electronegativity of the halogen.
- When a nucleophile (a species that donates an electron pair) approaches this carbon, it can attack the electron-deficient carbon atom, leading to the substitution of the halogen atom.
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