0 Question 15 Not yet answered Marked out of 5.00 Taking into account the given

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0 Question 15 Not yet answered Marked out of 5.00 Taking into account the given BOND DISSOCIATION energies calculate the overall enthalpy change (delta H) in the reaction + 2 H F Flag question ond H3C- HC(H)- CH2 H3C-CH2 H2C-H ond dissociation energy kJ/mol 13 23 159 39 H3C- HC(F)- CH3 H3C-CH2 H2C-F -F 70 Select one O a. +869 kJ / mol b.-710 kJ / mol O C. -869 kJ /mol d. +299 kJ / mol e. +710 kJ / mol f.-299 kJ / mol Question 16 Not yet answered Marked out of 5.00 Predict reagents that can be used to cause the following transformations CI CI Flag question Select one O a. Br2 with AICI3 C) b. Br2/CH3CH2OH O C. Br2+ Clh ° C. Br2 + Cl2 O d. BrCl Oe. C + HBr in the presence of ROOR

Explanation / Answer

1) the

H = (enthapy change for bond breaking) - (enthapy change for bond breaking )

       = ( 2x C-H + 1x F-F) -   (2xC-F   + 2 x H-F)

      = ( 413+ 423+ 159) - (439 + 444+ 2 x 570) = -1028 Kj/Mol

None of the options given are correct...

2) BrCl, its a electrophilic addition reaction, Br will be the electrophile and Cl- will be nucleophile

3) 2-bromo-2-methyl pentane,

4) d , generated chlorine is less reactive and more selective producing 2-cholro 2- methy pentane

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