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  • Expand the following bond-line formula to show all atoms including carbon and hydrogen. \<img alt="" src="https://cdn.entrance360.com/media/uploads/2019/11/09/q.png" style="height:177px;

Expand the following bond-line formula to show all atoms including carbon and hydrogen.

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Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)

best_answer

 

 

Complete, Condensed and Bond-line Structural Formulas -

Complete structural formula
Such a structural formula focuses on the electrons involved in bond formation. A single dash represents a single bond, double dash is used for double bond and a triple dash represents triple bond. Lone-pairs of electrons on heteroatoms (e.g., oxygen, nitrogen, sulphur, halogens etc.) may or may not be shown. Thus, ethane (C2H6), ethene (C2H4), ethyne (C2H2) and methanol (CH3OH) can be represented by the structural formulas as shown below. Such structural representations are called complete structural formulas.

  

Condensed structural formula
These structural formulas can be further abbreviated by omitting some or all of the dashes representing covalent bonds and by indicating the number of identical groups attached to an atom by a subscript. The resulting expression of the compound is called a condensed structural formula. Thus, ethane, ethene and ethyne can be written as:

Bond-line structural formula
In this bond-line structural representation of organic compounds, carbon and hydrogen atoms are not shown and the lines representing carbon-carbon bonds are drawn in a zig-zag fashion. The only atoms specifically written are oxygen, chlorine, nitrogen etc. The terminals denote methyl (–CH3) groups (unless indicated otherwise by a functional group), while the line junctions denote carbon atoms bonded to an appropriate number of hydrogens required to satisfy the valency of the carbon atoms. For example 3-Methyloctane is represented as follows:

 

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There are total 18 H atoms visible in option (4)

Therefore, option (4) is correct.

Posted by

HARSH KANKARIA

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