Single Choice

Arrange the (C -H) bonds x, y, and z in decreasing order of their bond dissociation energies in homolysis.

A$$y > x > z$$
B$$z > x > y$$
C$$z > y > x$$
Correct Answer
D$$y > z > x$$

Solution

Bond dissociation energy in hamolytic cleavage is directly prpoprtional to the bond strength as $$z \rightarrow sp^2$$ hybridised $$ \rightarrow$$ more strong than $$y$$ and $$x$$
$$y \rightarrow $$ having partial $$sp^2$$ character because of hyperconjugation.
$$x \rightarrow$$ No hyperconjugation, purely $$sp^3 \rightarrow$$ weakest bond.
Bond dissociation energy order is
$$ z > y > x$$

SIMILAR QUESTIONS

Chemical Bonding

Which of the following statement is true?

Chemical Bonding

Which has higher bond energy and stronger bond?

Chemical Bonding

The average $$S-F$$ bond energy in $$SF_6$$ if the $$\Delta H^o_f$$ values are $$-1100,\ +275$$ and $$+80$$ kJ/mol respectively for $$SF_6$$(g), $$S$$(g) and $$F$$(g) is:

Chemical Bonding

Strongest $$C-C$$ bond is present in:

Chemical Bonding

Arrange the following bonds according to their average bond energies in descending order : $$C - Cl$$, $$C-Br$$, $$C-F$$, $$C-I$$

Chemical Bonding

Arrange the following in order of increasing bond dissociation enthalpy. H−H, D−D and F−F

Chemical Bonding

Which of the following will be the strongest bond?

Chemical Bonding

Match the bond enthalpies given in column II with the molecules given in column I and mark the appropriate choice. Column I Column II (A) Hydrogen $$(H_2)$$ (i) 498.0 kJ $$mol^{-1}$$ (B) Oxygen $$(O_2)$$ (ii) 946.0 KJ $$mol^{-1}$$ (C) Nitrogen $$(N_2)$$ (iii) 435.8 kJ $$mol^{-1}$$

Chemical Bonding

In a bonded molecule, the order of repulsion between the bonded and non-bonded electrons is:

Chemical Bonding

Which of the following species absorb maximum energy in its HOMO-LUMO electronic transition?

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