Draw every enol and enolate ion that can arise from the given carbonyl compound. Draw the oxyanion species; do not draw carbanion resonance forms. a carbonyl bonded to a methyl group and an isopropyl group. This is 3 methyl butan 2 one or methyl isopropyl ketone.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.