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Practice Test 11

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The bond order in N₂⁺ is

1.5
3.0
2.5
2.0

Solution

Which of the following statements is not correct for sigma and pi-bonds formed between two carbon atoms?

Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard
Sigma-bond is stronger than a pi-bond
Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively
Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond

Solution

As sigma bond is stronger than the ? (pi) bond, so it must be having higher bond energy than ?(pi) bond.

In which of the following species is the underlined carbon having sp³– hybridisation ?

CH₃– COOH
CH₃ CH₂ OH
CH₃COCH₃
CH₂ = CH - CH₃

Solution

In CH₃CH₂OH underlined C is forming 4 ? bonds, hence sp^{3/sup> hybridisation. In others it is sp² hybridised (due to 3 ? bonds).}

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Chemical Bonding And Molecular Structure

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