From the given compounds, the compound exhibiting the cis-trans isomerism needs to be determined. Concept introduction: Cis-trans isomerism is also known as Configurational or geometrical isomerism. The prefixes cis and trans are Latin words in which ‘‘cis’’ represents ‘‘this side of’’ and ‘‘trans’’ represents ‘‘the other side’’. This type of isomerism occurs in unsaturated compounds (i.e. double bonds) or cyclic compounds depending on the presence of substituted groups in a molecule.

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 21, Problem 21E

Interpretation Introduction

Interpretation: From the given compounds, the compound exhibiting the cis-trans isomerism needs to be determined.

Concept introduction: Cis-trans isomerism is also known as Configurational or geometrical isomerism. The prefixes cis and trans are Latin words in which ‘‘cis’’ represents ‘‘this side of’’ and ‘‘trans’’ represents ‘‘the other side’’. This type of isomerism occurs in unsaturated compounds (i.e. double bonds) or cyclic compounds depending on the presence of substituted groups in a molecule.

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