JEE AdvancedChemistryBasics of Organic ChemistryMCQ+3 / −1
The amount of energy required to break a bond is same as the amount of energy released when the same bond is formed. In gaseous state, the energy required for homolytic cleavage of a bond is called Bond Dissociation Energy (BDE) or Bond Strength. BDE is affected by s-character of the bond and the stability of the radicals formed. Shorter bonds are typically stronger bonds. BDEs for some bonds are given below :
(g) + H = 58 kcal mol 1 (g) + H = 85 kcal mol 1 (g) + H = 103 kcal mol 1For the following reaction (g) + (g) (g) + (g) the correct statement is
(g) + H = 58 kcal mol 1 (g) + H = 85 kcal mol 1 (g) + H = 103 kcal mol 1For the following reaction (g) + (g) (g) + (g) the correct statement is- AInitiation step is exothermic with H = 58 kcal mol 1.
- BPropagation step involving formation is exothermic with H = 2 kcal mol 1.
- CPropagation step involving formation is endothermic with H = +27 kcal mol 1.
- DThe reaction is exothermic with H = 25 kcal mol 1.
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