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What are the series of chemical reactions in manufacture of isoprene from isomerization of polypropylene dimer?

What are the series of chemical reactions in manufacture of isoprene from isomerization of polypropylene dimer? Correct Answer Dimerization-Isomerization-Pyrolysis

Initially propylene is dimerized using tripropyl aluminium as catalyst which forms 2-methyl-1-pentene which further on isomerization forms 2-methyl-2-pentene and finally undergoes pyrolysis to form isoprene.

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In a survey of 100 students, it was found that 25 students have enrolled for Navy AA test series, 26 students have enrolled for NDA test series, 26 students have enrolled for Airforce group X test series, 9 students have enrolled for both Navy AA and Airforce group X test series, 11 students have enrolled for both Navy AA and NDA test series, 8 students have enrolled for both NDA and Airforce group X test series whereas 3 students have enrolled in all three test series. Find the number of students who has not enrolled in any of the test series.
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How is permaculture farming different from conventional chemical farming? 1. Permaculture farming discourages monocultural practices but in conventional chemical farming, monoculture practices are predominant. 2. Conventional chemical farming can cause an increase in soil salinity but the occurrence of such phenomenon is not observed in permaculture farming. 3. Conventional chemical farming is easily possible in semi-arid regions but permaculture farming is not so easily possible in such regions. 4. Practice of mulching is very important in permaculture farming but not necessarily so conventional chemical farming Select the correct answer using the code given below.  
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