Guanidine, (NH2)2 C=NH is said to be the...

Guanidine, `(NH_2)_2 C=NH` is said to be the strongest nitrogen containing organic base because

it has two `NH_2` groups

it has three nitrogen atoms that can be protonated

its amino group is first protonated

its conjugate acid is very much stable due to three equivalent structures

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The correct Answer is:

Unusual stability of the conjugate acid of guanidine explains why guanidine is the strongest organic known base.

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