B-2.Rank the following carbocations in order of increasing stability (leastAmost):(a)123(c)312(b)231(d)213B-3.Hydrogenation of cyclohexene releases 120 kJ/mol (28.6 kcal/mol) of heat. Which of thefollowing 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 samecarbocation on ionization?(a)1 and 3(c)1 and 2(b)2 and 4(d)1 and 4B-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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