Question #26 needed QUE STION 20Consider the dehydration reaction using the starting material shown below to answer questions 20 23.HODehydrationWhich reagent(s) are required lo perform a dehydration reaction?O a. heal, NaOHOb. HCIO c H2SO4O e. NaHOf NaOHO 9 H20QUE STION 21Identify all carbocations thal appear in the mechansim for this reaction. Choose all that apply.i)i)iv)IVNone of the above. The reaction goes by an E2 mechanism and no carbocalions are formed.QUE STION 22Consider the mechanism that occurs in this reaction. Which generlc arrow pushing mectianism best describes the deprotonation step that occurs in the mechanism in order to form the final alkene product?I)I)III)CH,CH,IV)CHO IIO VQUE STION 23Dehydration reaclions ALWAY S form the most stable alkene as the major product. What is the major organic product formed during this reaction?ii)iii)iv)IV QUESTION 24For problems 24-30, answer the questions about the 2-step reaction sequence shown below.Reaction 1IntermediateProduct YReaction 2HOWhat new functional group is found in the final product?О а. CarbonylO b. AlcoholОс. AlkyneO d. Tert-butyl groupO e. AlkeneO f. a,B-unsaturated carbonylQUESTION 25Dehydration WILL NOT produce the desired product from the given starting material. (See questions 20-23 for comparison.) We need more control over the sterochemistry to synthesize the correct product; we need to use an E2 reaction. In addition to a strong base, what other components does an E2 reaction require? Choose all that apply.O1. An antiperiplanar relationship between the leaving group and a H atom.O II. A good leaving groupO II. A gauche relationship between the leaving group and a H atom.O IV. An eclipsed relationship between the leaving group and a H atom.OV. A carbocationQUESTION 26Based on your answer to the previous problem, which conformation is needed to produce the desired product through an E2 mechanism?H3CHCHČ(CH3)3HLGHLG CH3H3C Hby(H3C)3C CH3LGH LGFCH3(H3C)3C LG(H,C),CYCH,(H3C)3C CH3CdeO O O 0O

Question

Accepted Answer

For E2 elimination reaction there must be presence of antiperiplanar position of leaving group and H…

**** LG CH, CH (H,C),cCH, CH, (H,C),CCH, (H,C),CLa HLG