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Reductions Involving Aldehydes or Ketones

which of the ...

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which of the following bonds had highest bond energy 1.H-H Bond in H2 2.C-C bond in C2H6 3.N-N bond N2H4 4.O-O bond in H2O2

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Q. The sigma bond energy of C-H bond in

C_{2} H_{6}

Δ H_{f}

C_{2} H_{4} = 12.5 k c a l

Heat of atomisation of

C = 171 k c a l

. Bond energy of

H_{2} = 104.3 k c a l

C - H = 99.3 k c a l

C = C

Q. Which of the following bonds has highest bond energy?

Q. Bond energies can be obtained by using the following relation:

Δ H (r e a c t i o n) = \sum

Bond energy of bonds, broken in the reactants

- \sum

Bond energy of bonds, formed in the products.

Bond energy depends on three factors:

a. greater is the bond length, lesser is the bond energy
b. bond energy increases with the bond multiplicity
c. bond energy increases with the electronegativity difference between the bonding atoms. Which among the following sequences is correct about the bond energy of

C - C

C = C

C \equiv C

Q. Which of the following bond has the highest bond energy?

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