ure east.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator assi

Question

ure east.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator assignment-take&ta; onLocator-assign C-H Bond Dissociation Enthalpies in kl/mol pt C-H Bond BDE (kJ/mo CHBond BDE (kl/mol C-H Bond BDE(kl/mol HC-H C2Hs-H 422 (Hy C)2HC-H 414 (H, C)sC-H 405 CRs-H HCEC-H 1556 R-alkyl pt 439 RH2C-H 422 R2HC-H 414 H2C-HC-H 464 RHC-HC-H 464 R2C-HC-H 464 RC C-H 556 Ar-aromatic H2C-HC-H2CH 372 RHC-HC-RHC-H 372 RHC RCRHC-H 372 R2C RC-RHC-H 372 Ar-H Ar-H2C-H Ar(H, C)HC-H 376 405 472 376 ot Use the above table to estimate the bond dissociation enthalpy (BDE) of each indicated bond in the compound below pt Give the bond energies in kT mol BDE C BDE B: BDE A Which bond reacts fastest in a radacal reaction

Explanation / Answer

A- 372 kj/mol

B- 464 kj/mol

C- 372 kj/mol

Bond A is more reactive since less BDE, easily broken and formed carbanion is stabilized by resonance.

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