KPK Board 12th class Chemistry Ch 17 Alkyl Halides short questions answers
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|Nucleophilic Substitution Reactions||Electrophilic Substitution Reactions|
|Reactions in in which a nucleophile is replaced another nucleophile.||Reactions by which an electrophile is replaced by another electrophile.|
|They are represented as SN reactions.||They are represented as ES reactions.|
|They are characteristic hydrocarbons i.e. alkyl halides alcohols etc.||They are characteristic reactions of aliphatic reactions of aromatic hydrocarbons.|
|A strong nucleophile replaces a weak nucleophile.||A strong electrophile replaces a weak nucleophile.|
|Depend upon nature of solvent.||Does not depend upon nature solvent.|
Nucleophile: OH group of NaOH
Molecule attacked = CH3-CH2-Cl OH– ions will attack carbon atom bearing halogen atom i.e. leaving group.
- leaving group
Leaving group: The group or specie which leaves the substrate or which is being replaced by the incoming entering group.
Carbocation: When a halogen atom of alkyl halide detached it form the ions substrate, these ion substrate is positive charge and negative charge species. The ion which contains the positive charged carbon atom is called carbocation.