Fill in the blank line with the correct answer: a) The isomerization of dimethyl
ID: 499140 • Letter: F
Question
Fill in the blank line with the correct answer: a) The isomerization of dimethyl maleate (DM) to dimethyl fumarate (DF) is irreversible because b) Bromine is necessary to isomerize dimethyl maleate to dimethyl fumarate in order to c) As seen on TLC, dimethyl fumarate is less polar than dimethyl maleate because d) Dimethyl fumarate is a solid whereas dimethyl maleate is a liquid because e) The dehydration reaction of Cyclohexanol with H PO proceeds by _____ mechanism through the formation of a intermediate f) Cyclohexanol has a very high BP (161 degree C) whereas the product Cyclohexene has a significantly lower BP (83 degree C) because _____ has _____ whereas _____ only has g) The double bond in dimethyl maleate and dimethyl fumarate is electron _____ h) Dimethyl maleate would participate in Diels-Alder reaction as a _____ i) An acyclic conjugated diene must be in the _____ conformation to participate in the Diels-Alder reaction. j) Diels-Alder reaction is considered to be a concerted (4+2) cycloaddition reaction because _____Explanation / Answer
(a) The isomerization of DM to DF is irreversible because DM is cis where as DF is trans. And we know that trans is more stable product than cis.
(b) Bromine is necessary to isomerize dm to df in order to form an intermediate carbon radical. In the free radical intermediate, free rotation about the carbon-carbon single bond is possible.
(c) DF(trans) is less polar than DM (cis) because trans as we know will always be non-polar as it is symmetrical and cis will always be polar as it is lacking symmetry .
(d)DF is solid where as DM is liquid because DF and DM are geometric isomers of each other, that means they differ in physical properties like m.p. , for this reason at room temperature they are at different states.
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