Question

Pls help with questions

First Nalle Klein, Chapters 8-10 Last name. 110 Points Part 1. Short answer (5 pts each). 1. 5-Decyne is converted to 5-decanone using Hg (504). H30 2. Draw the structure of (E)-3-methylhept-2-en-4-yne 3. Rank the following alkenes in order of increasing stability Trans alkene more stable than is alkene #, 1. Which term best describes the stereochemistry about the double bond? 4. CHO 5. What is the best reagent to convert 2-butyne to cis-2-butene? 6. What is the best reagent for the conversion of (S)-2-pentanol to 2-pentene? 7. Which compound is more reactive toward E2 elimination? &

Answer 1

Question no 1 & 2 which you have written answers are right. 6 More substituted alkenes arce more ste due to hyper consigation as increased number of substitution provides more number of e-c and e-H bond to interact weath pi star (T* orbital. a hence lll is most stable then iv is second most stable. In between (I) & (I), I is more stable because it is in trans torm. As in is form steric hindrance occur hence is borm is less stable. the correct order is. CHO we know that in the left side of double bond e gets more preterence than d as d is hydrogen and se is (Hz. now come to right side atom both a and to has ch, hence we move to the next atom, and in the next atom. both has oxygen but in CHO oxygen is doubly bonded, hence cho has

A higher priority, since a higher priority group are opposite to each other the conformation is E. do obtain is - arkene from alkyne. rundlare catalyst, da reagent is the best. Hence to prepare a cis-2-butene from abutyne lindlar catalyst 42 is the best reagent.