The bond lengths of carbon-carbon, carbon-nitrogen, carbon- oxygen, and nitrogen-nitrogen single, double, and triple bonds are listed in Table 8.5. Plot bond enthalpy (Table 8.4) versus bond length for these bonds (as in Figure 8.17).What do you conclude about the relationship between bond length and bond enthalpy? What do you conclude about the relative strengths of C¬C, C¬N, C¬O, and N¬N bonds?

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TABLE 8.4 Average Bond Enthalpies (kJ/mol) Single Bonds C H с-с C -N с_o C F C CI C Br 391 163 201 272 O-Cl 203 200 243 463 146 190 413 348 293 358 485 328 276 240 259 N-H 155 O-O OF CI-F CI-CI 253 N-F N-CI N Br 242 O-I 234 237 218 193 S H Br-Cl 436 SF 567 431 366 299 339 327 253 218 266 S-Cl S Br S-S C S HF H-Cl H -Br H-I I-CI I-Br 208 175 151 Si-H Si Si Si-C Si-。 Si Cl 323 226 301 368 464 Multiple Bonds 614 839 615 891 799 1072 495 418 941 607 S O 523 418 C N C O TABLE 8.5 Average Bond Lengths for Some Single, Double and Triple Bonds Bond C-C Bond Length (Å) 1.54 1.34 1.20 1.43 1.38 1.16 Bond Length (Å) 1.47 1.24 1.10 1.36 1.22 Bond N -N C-N O-O 1.48 1.21 C O 1.43 1.23 1.13 1000 ︵ 900 E 800 700 600 E 500 400 300 200 100 1ぶiki N-N N-N 1.00 1.10 1.20 1.30 1.40 1.50 N-N bond length (A)