Q. Guanidine, , is said to be the strongest nitrogen containing organic base because:

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It has two groups.

It has three nitrogen atoms that can be protonated.

It is less stable as compared to the protonated species.

Its conjugate acid is very much stable due to three equivalent structure.

Solution:

On the basis of hybridisation, of with less character should be more basic than of the aimino group. However, of imino group is more basic and it is this nitrogen which is protonated because its conjugate acid is resonance hybrid of three equivalent structure which accounts its unusual stability.

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3. Which one of the following is not a primary amine?

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4. Which one of the following reagent will convert acetamide to ethanamine?

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5. Which of the following will not give a primary amine?

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