Using the data in the following table, predict the sign and magnitude of ΔH° for each of the following reactions. In each case, identify whether the reaction is expected to be endothermic or exothermic:

a.

b.

c.

d.

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KJ/MOL KCAL/MOL к./мOL KCAL/MOL кJ/мOL KCAL/мOL Нас—сн сHз (CH3)2CH F (CH3)2CH CI Bonds to H 385 92 444 106 435 104 НC-С-СНз 489 117 335 80 H CH3 435 104 (CH3)2CH-Br 285 68 н сн-CHз Bonds to methyl 410 98 222 53 (CH3),CHH н СНICH)2 397 95 CHH 435 104 (CH3)2CH-OH 381 91 н ССH)з 381 91 456 109 CH3F CH3 473 113 351 84 CH; CI Н Нас—С—х 293 70 CH3-Br 234 56 CH;H CHз 356 85 Н Cн ОН 381 91 (CH)3C— Н 381 91 (CH)3C-F 444 106 Н 111 464 (CH3)3C-CI 331 79 Н Нас—с—х 272 65 (CHС—Вг 364 87 Н Н (CHд)3C— 209 50 CH3CH2 H 410 98 569 136 (CH)3с—ОН 381 91 448 107 CH3CH2 F H-CI 431 103 CH;CH,-CI 339 81 X-X bonds HBr 368 88 CH3CH2 Br 285 68 159 38 нн 297 71 222 53 CH;CH,H 498 119 C-CI 242 58 H-OH Cн CHz—ОН 381 91 435 192 46 HOCH2CH3 104 Br Br 151 36 CHз C-C bonds 213 51 но-ОН HаС —с —х CH CНз 368 88 Н CH,CH CHЗ 356 85 (CH)2CH H 351 397 95 84 (CH3)2CH CH3 Br Br, НBr