NEETChemistryGeneral Organic Chemistry
Paragraph: 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 be
Options
- AP - iii , Q - iv , R - ii , S - i
- BP - i , Q - ii , R - iii , S - iv
- CP - iii , Q - ii , R - i , S - iv
- DP - ii , Q - i , R - iv , S - iii
Correct answer
A. P - iii , Q - iv , R - ii , S - i
Step-by-step solution
Relative stability of radicals : C ∙ sp ≡ CH > C ∙ H sp 2 = CH 2 > C ∙ H 2 − Ph sp 3 Resonance stabilized > C ∙ H CH 3 2 sp 3 So, BDE H − C ≡ CH H − CH = CH 2 H − CH 2 − Ph H − CH CH 3 2 BDE 132 110 88 95 Electronegativity ∝ % s - character ∝ bond strength ∝ BDE