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Which of the following does not contain coordinate bond?

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Important Questions on Chemical Bonding and Molecular Structure

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N2O is isoelectronic with CO2 and N3-, which is the structure of N2O?
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What are the formal charges on B and N, respectively in the given structure?

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For hydrazoic acid, which of the following resonating structure will be least stable?

H-N=N+=N-(I)H-N+-N+=N2-(II)H-N--N+N(III)

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Which of the following overlaps is incorrect [assuming z-axis to be the internuclear axis]?

(a) 2py+2pyπ2py

(b) 2pz+2pzσ2pz

(c) 2px+2pxπ2px

(d) 1s+2pyπ(1s-2py)

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Which of the following statements is correct about the π-bond?
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p-p overlapping will be observed in the molecule of: