11. Which of the following is a TRUE statement? A. SeO2has two equivalent resonance structures. B. XeF4obeys the octet rule. C. The structure NOBr is more stable than ONBr. D. Because of fluorine’s high electronegativity, the FF bond is very polar. E. None of the above statements is true. 12. Given the following bond energies CC (348 kJ/mole), C=C (614 kJ/mole), HH (436 kJ/mole) and the heat of reaction for the following process, estimate the CH bond energy. C2H4+ H2C2H6H = 137 kJ 13. Using the bond energy data tabulated below, estimate the enthalpy of formation (per mole) of NH3(g). Bond Average bond energy (kJ/mol) NN(N2) 941 HH 436 NH 391 The correct answer (in kJ/mol) is closest to 14. Following are some average bond energies (kJ/mol): C–H 413 O–H 463 C=C 614 C–C 348 O–O 146 C=O 799 C–O 358 O2495 Estimate the heat released in the complete combustion of ethylene, H2C=CH2. Supplemental Problems CHEM 110 - Spring 2011 23
Organic 1. Which of the following are not acceptable structures for C4H10? 1) 2) 3) 4) 5) A. 1 and 2 B. 2 and 3 C. 3 and 4 D. 3 and 5 E. 1, 3 and 5 2. Which of the following is(are) not correct structure(s) of octane C8H18? 1) 2) 3) 3. Which of the following Lewis structures are incorrect? I II III 4. Of the structures shown below, which is a structural isomer of n-pentane? CH3CHCH3CH3CH3CH2CH2CH3CCCHHHHHHHCHHHCH3CHCH3CH2CH3CCH3HHCH3C H HHC C H HH H CH H CH HC H HC H HC HH H H C H H C H C H C H C H H H C H H C H H CHHH C CC C C H H H H H H H H H C HH C HH C H H H CHHHCHNHCCCCCHHHHHCH2CH2CH2CH2CH2CH2CH3CH2CCH3CH3CH3CH3CH2CHCH3CH3CH3CHCHCH2CH3CH3CHCH3CH2CH2CH3OCCHHN:H:: Supplemental Problems CHEM 110 - Spring 2011 24
NOHCH3Organic continued 5. Which of the compounds shown below can have a geometrical isomer? 1. 2. 3. a) 1 only b) 2 only c) 3 only d) 1 and 2 e) 2 and 3 6. Which of the following is/are geometric isomers of the structure below?
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- Reaction, C H H H H H H C C C C H H C C C H H H H H H H H H H H H H H H H, H H C C H H H C H H H H C C C H C C H H H H H A., C C C C C C C H C H H H H H H