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Which of the following is the correct order of basicity for the given amines?

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Question: Which of the following is the correct order of basicity for the given amines?

Options:

  1. RNH2 > R2NH > R3N
  2. R3N > R2NH > RNH2
  3. R2NH > R3N > RNH2
  4. RNH2 > R3N > R2NH

Correct Answer: RNH2 > R2NH > R3N

Solution: 

The basicity of amines decreases with increasing alkyl substitution due to steric hindrance and electron-donating effects.

Which of the following is the correct order of basicity for the given amines?

Practice Questions

Q1
Which of the following is the correct order of basicity for the given amines?
  1. RNH2 > R2NH > R3N
  2. R3N > R2NH > RNH2
  3. R2NH > R3N > RNH2
  4. RNH2 > R3N > R2NH

Questions & Step-by-Step Solutions

Which of the following is the correct order of basicity for the given amines?
Correct Answer: Tertiary > Secondary > Primary
  • Step 1: Understand that basicity refers to how well a substance can accept protons (H+).
  • Step 2: Recognize that amines are compounds that contain nitrogen and can act as bases.
  • Step 3: Identify the types of amines: primary (1 alkyl group), secondary (2 alkyl groups), and tertiary (3 alkyl groups).
  • Step 4: Know that as the number of alkyl groups increases, steric hindrance (crowding around the nitrogen) increases.
  • Step 5: Realize that more alkyl groups also mean more electron-donating effects, which can stabilize the positive charge when the amine accepts a proton.
  • Step 6: Conclude that the basicity decreases with more alkyl substitution due to the combined effects of steric hindrance and electron donation.
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