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Dolbier HW Solutions 257 - 251 CONJUGATION IN ALKADIENES...

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B-2. Rank the following carbocations in order of increasing stability (least A most): ( a ) 1 2 3 ( c ) 3 1 2 ( b ) 2 3 1 ( d ) 2 1 3 B-3. Hydrogenation of cyclohexene releases 120 kJ/mol (28.6 kcal/mol) of heat. Which of the following most likely represents the observed heat of hydrogenation of 1,3-cyclohexadiene? ( a ) 232 kJ/mol (55.4 kcal/mol) ( b ) 240 kJ/mol (57.2 kcal/mol) ( c ) 247 kJ/mol (59.0 kcal/mol) ( d ) 120 kJ/mol (28.6 kcal/mol) B-4. Which of the following compounds give the same carbocation on ionization? ( a ) 1 and 3 ( c ) 1 and 2 ( b ) 2 and 4 ( d ) 1 and 4 B-5. For the following reactions the major products are shown: These provide an example of ______ control at low temperature and ______ control at
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