Question

Rank the alkyl halides in each group in order of increasing E2 reactivity a. ш -сн, 2 Rank the alkyl halides in each group of problem one in order of increasing El reactivity 3. Which elimination reaction in each pair is faster? (I or II) a. сн, нс. "он II b. OH он (CH),CCI L (CHса IL но DMSO What alkenes are formed from each alkyl halide by an E2 reaction? Make sure to include all possible stereoisomers. Label the major product predicted by Zaitsev rule. Label the major product predicted by Hoffman rule. Label the major product that would be formed with the specified strong base. "оссH,, OH
i did seprate questions for these 4 and i was given wrong solutions. can you help with these

Answer 1

1. A. Reactivity order for E2= 1°> 2°>3° alkyl halides

Hence order, II > I > III

B. Br is good leaving group than Cl.

Hence , I < III < II

2. Order of reactivity towards E1: 3°>2°>1° alkyl halides

Hence order, a. III > I> II

B. III > I > II

3. A. I, since it is 3° halide, undergo E1 elimination, while second takes time to get more stable carbocation intermediate by rearrangement from less stable 2° intermediate.

B. I, since it is done in polar solvent which enhances the reactivity towards ionization. Hence Faster than ii which is done in non polar solvents.

4. More substitited alkene is more stable by Saytzev rule and by Hoffman elimination, less substitited alkene is major

Hottmann Produdt Spyttc's phosay Prosuct