With the help of the DH values given in Tables 3-1 and 3-4, calculate the H values

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With the help of the DHº values given in Tables 3-1 and 3-4, calculate the ΔHº values for addition of each of the following molecules to ethene, using 65 kcal mol-1 for the carbon – carbon π bond strength.

(a) Cl2

(b) IF (DHº = 67 kcal mol-1)

(c) IBr (DHº = 43 kcal mol-1)

(d) HF

(e) HI

(f) HO – Cl (DHº = 60 kcal mol-1)

(g) Br – CN (DHº = 83 kcal mol-1; DHº for Csp3 – CN = 124 kcal mol-1)

(h) CH3S – H (DHº = 88 kcal mol-1; DHº for Csp3 – S = 60 kcal mol-1)

Table 3-1 Bond-Dissociation Energies of Various A-B Bonds in the Gas Phase [DH° in kcal mol- (kJ mol-1)1 B in A-B A in A-B -H -F -CI -Br -I -OH -NH, H- 104 (435) 136 (569) 103 (431) 87 (364) 71 (297) 119 (498) 108 (452) CH3- 105 (439) 110


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Organic Chemistry structure and function

ISBN: 978-1429204941

6th edition

Authors: K. Peter C. Vollhardt, Neil E. Schore

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