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Question

I. CH2=CHCH=CHNH3
II. CH2CH=CHCHNH3
III. CH2CH=CHCH=NH3
Which of these structures is not a valid canonical structure?

A
I
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B
II
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C
III
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D
None of these
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Solution

The correct option is B II
for a resonanee structure to be valid there should be fully filled octet of molecules, less charge separation and negative charge on more electronegative and positive charge on less electronegative atom. So, II is not a stable canonical structure. Correct answer is B).

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