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Karnataka Board PUCPUC Science Class 11

Carbon and silicon both belong to the group 14, but inspite of the stoichiometric similarity, the dioxides, (i.e., carbon dioxide and silicon dioxide), differ in their structures. Comment. - Chemistry

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Question

Carbon and silicon both belong to the group 14, but inspite of the stoichiometric similarity, the dioxides, (i.e., carbon dioxide and silicon dioxide), differ in their structures. Comment.

Short/Brief Note
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Solution

Carbon, the first member of group 14 possesses a pronounced ability to form stable p-p multiple bonds with itself and with other first row elements such as nitrogen and oxygen. In CO2, both the oxygen atoms are linked with carbon atom by double bonds.

\[\ce{O \overset{σ}{\underset{π}{=}} C \overset{σ}{\underset{π}{=}} O}\]

However, silicon shows its reluctance in forming p-p multiple bonding due to large atomic size. Thus, in Si02, oxygen atoms are linked to silicon atom by single covalent bonds giving three-dimensional network.

\[\begin{array}{cc}
\phantom{.}|\phantom{.........}|\phantom{..}\\
\phantom{.}\ce{O}\phantom{........}\ce{O}\phantom{..}\\
\phantom{.}|\phantom{.........}|\phantom{..}\\
\ce{- O - Si - O - Si - O -}\\
\phantom{.}|\phantom{.........}|\phantom{..}\\\
\phantom{.}\ce{O}\phantom{........}\ce{O}\phantom{..}\\
\phantom{.}|\phantom{.........}|\phantom{..}
\end{array}\]

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Group 14 Elements - The Carbon Family
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Chapter 11: The p-block Elements - Multiple Choice Questions (Type - I) [Page 138]

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NCERT Exemplar Chemistry [English] Class 11
Chapter 11 The p-block Elements
Multiple Choice Questions (Type - I) | Q 29 | Page 138

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