The reason why the double bond of tetrachloroethene is undetectable in the bromine test for unsaturation is to be explained. Concept Introduction: Bromination leads to the addition reaction of alkenes or alkynes and also the formation of haloalkanes . This is used as a test for the detection of unsaturated compounds.

Question

b) i) Draw the different structural isomers of the 6-membered ring compound [GAAIBNPAS]H6 in which there are alternating Group 13 and 15 elements. ii) The isomers containing both B-N and AI-N bonding are the most stable. Explain why this is the case. ii) How would you expect the structure and reactivity of the heterocycles [GAAIBNPAS]H6 to compare with borazine? iv) While borazine exists as a planar ring compound, the [GAAIBNPAS]H6 ring compounds dimerize. Explain these observations. H -ЕН -E H-E НЕ ЕН E НЕ- ЕН H `E H. H É-H НЕ E = Heteroatom エー山、 w-I

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Chapter 8, Problem 41P

Interpretation Introduction

Interpretation:

The reason why the double bond of tetrachloroethene is undetectable in the bromine test for unsaturation is to be explained.

Concept Introduction:

Bromination leads to the addition reaction of alkenes or alkynes and also the formation of haloalkanes. This is used as a test for the detection of unsaturated compounds.

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b) i) Draw the different structural isomers of the 6-membered ring compound [GAAIBNPAS]H6 in which there are alternating Group 13 and 15 elements. ii) The isomers containing both B-N and AI-N bonding are the most stable. Explain why this is the case. ii) How would you expect the structure and reactivity of the heterocycles [GAAIBNPAS]H6 to compare with borazine? iv) While borazine exists as a planar ring compound, the [GAAIBNPAS]H6 ring compounds dimerize. Explain these observations. H -ЕН -E H-E НЕ ЕН E НЕ- ЕН H `E H. H É-H НЕ E = Heteroatom エー山、 w-I

Assuming that benzaldehyde is the limiting reagent for the synthesis of stilbene, that stilbene is the limiting reagent for the synthesis of stilbene dibromide, and that stilbene dibromide is the limiting reagent for the synthesis of diphenylacetylene; what is the overall % yield of diphenylacetylene from benzaldehyde given the percentage yield of each step of the reaction sequence as follows? Give only two significant digits. If the answer is a whole number with two digits, do not include the decimal. benza Idehy de Notes: 66% stil be ne 23% stilbene dibromi de 66% dipheny lacetyle ne

Assuming that benzaldehyde is the limiting reagent for the synthesis of stilbene, that stilbene is the limiting reagent for the synthesis of stilbene dibromide, and that stilbene dibromide is the limiting reagent for the synthesis of diphenylacetylene; what is the overall % yield of diphenylacetylene from benzaldehyde given the percentage yield of each step of the reaction sequence as follows? Give only two significant digits. If the answer is a whole number with two digits, do not include the decimal. 52% 87% benzaldehyde → stilbene → stilbene dibromide 41% Answer: diphenylacetylene Notes: For our multi-step synthesis we cannot just calculate the yield based on starting amount of benzaldehyde and final amount of diphenylacetylene because your group may have been supplemented with commercial material at one or more steps. In truth most chemist use an excess of the least expensive reagent to increase their yield. So in our case benzyltriphenylphosphonium chloride should probably be our…