4. Calculate the total number of sigma bonds and total number of pi bonds in each of the following compounds. a. HH :D: +1 I H-N-C-C-O-H I H b. HH H Н :N=C-C-C=C-CEC-H :0: total o H-C-H H-C = `C-H I H. 11 H-C = C= CH H total o total π total π 1 H
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- Specify the formal charge at each of the labeled atoms, a - c, in each of the following structures. H b c H-C-C=C: a 1. а. b. с. H H3C–N=N=N: a b c 2. а. b. с. >Single Bonds Multiple Bonds H-H 432 N-H 391 149 c=C 614 H-F 565 N-N 160 |-CI 208 C=C 839 H-CI 175 427 363 495 745 1072 N-F 272 -Br 0-0 H-Br N-CI 200 C-0* H-I 295 N-Br 243 S-H 347 C=0 N-O 201 S-F 327 N-0 607 S-CI S-Br 253 218 C-H 413 O-H 467 N=N 418 347 305 358 C-C 0-0 146 N=N 941 C-N O-F 190 S-S 266 C=N 891 0-CI 203 c=N 615 3. Given the table of bond dissociation energies above (in kJ/mol), estimate the energy change for the following reaction. + 2 F2 → 4 HF + N2Which of the highlighted chemical bonds in the molecules below is longest? Shortest? In between? Which highlighted bond requires the highest energy to break? Lowest? In between? Answer these questions by completing the second and third columns in the table.
- Rank the indicated C—C bonds in increasing order of bond length. Explain as why to the difference.4. Which two of the following structures represent correct Lewis structures of a compound with molecular formula C2H;N? H H H ннн H H H H :N-H H H H-C-N-C-H н-с-N-с-н C-C-N-H `c=N-c-H H-C-C-H H H H H H H H H H H H H нн 1 2 3 4 5 3 and 5 O 2 and 4 1 and 4 O 1 and 3Specify the formal charge at each of the labeled atoms, a - c, in each of the following structures. H |bc 1. H-C-C=C: 2. a H H3C-N=N=N: a b c a. a. b. b. C.
- Which of the following contributing resonance structures is more important in the two examples below? Example 1 HC H H CIC H H H3C- :0: More important resonance structure = Example 2 •O -CH3 -NH₂ More important resonance structure = HC H H C=C H •0° :0: H₂C_C_NH₂ -CH3Determine the number of o bonds and bonds in each of the molecules. H₂C=CC1₂ number of o bonds: HOOC–COOH number of o bonds: FHC=C=CHF number of o bonds: H H x10 number of o bonds: H H TOOLS number of bonds: number of bonds: number of bonds: number of bonds:Lewis Structure :N=C-C=N: X4 H-O-N- :0: HH H H-C=C-N=NC=C-H CC-NOH :Ö-H H HCC-CC-CC-C=N: H HHH H 0-C-C-C-C-Ö: I H Total # of Sigma Bonds Total # of Pi Bonds
- For each full Lewis structure below, draw a bond-line structure. H ннн H :0: H a) H-C-C-C-H b) : Br-C-C-C-H н но-н H H H :Br: H C=0: H-C-H H-C-H H-C-H d) H2C CH c) CH2 H-C-H H2C C. H2 H-C-H Н-С-н HICChoose the best Lewis structure for CH₂Cl2. H---C-H H :c-c-c: H H-H-C-C-C: H -C-Cl H H CI=C=C1: 'HThe bond dissociation energy, in kJ, to break 1 bond in 1 mole of CO2 molecules is Single H Bond 432 411 386 459 HUN O C C=C C=C Multiple Bonds CN 346 305 167 358 602 201 O 142 C=O 799 CEO 1072 835 C=N 615 0=0 494 C=N 887 NEN 942 **All values in kJ/mol**