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Alkyl halides
8 Class 12 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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The functional group in an alkyl halide is:
- 1 -COOH
- 2 -OH
- 3 -X (a halogen)
- 4 -NH2
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Correct answer: -X (a halogen)
An alkyl halide has a halogen bonded to an alkyl group.
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Alkyl halides undergo mainly:
- 1 Electrophilic addition
- 2 Combustion only
- 3 Nucleophilic substitution
- 4 Polymerisation
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Correct answer: Nucleophilic substitution
A nucleophile replaces the halogen.
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Aqueous NaOH converts bromoethane into:
- 1 Ethanal
- 2 Ethanol
- 3 Ethene
- 4 Ethane
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Ethanolic KOH converts bromoethane mainly into:
- 1 Ethanol
- 2 Ethane
- 3 Ethanoic acid
- 4 Ethene
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Which halide is the most reactive towards substitution (same alkyl group)?
- 1 Iodide
- 2 Chloride
- 3 All equal
- 4 Fluoride
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Correct answer: Iodide
The C-I bond is the weakest, so iodide leaves most easily.
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Chloroform has the formula:
- 1 CHCl3
- 2 CCl4
- 3 CH3Cl
- 4 CH2Cl2
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In an SN2 reaction the nucleophile attacks:
- 1 The hydrogen only
- 2 From the same side
- 3 The solvent
- 4 From the side opposite the leaving group
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Correct answer: From the side opposite the leaving group
This inverts the configuration.
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Alkyl chlorides can be made from alcohols by reaction with:
- 1 Water
- 2 NaCl
- 3 PCl5 or SOCl2
- 4 NaOH
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Correct answer: PCl5 or SOCl2
These reagents replace the OH group with Cl.