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A student is summarizing information about the first four alkanes in the homologous series.

Complete the table to show:

AlkaneMolecular formulaDisplayed formula of one molecule
MethaneCH4\text{CH}_4CH4​Displayed formula of methane: a central C atom single-bonded to four surrounding H atoms arranged cross-wise (top, bottom, left, and right).
EthaneC2H6\text{C}_2\text{H}_6C2​H6​(i)
Propane(ii)Displayed formula of propane: three C atoms in a horizontal row connected by single C-C bonds. The end C atoms are each bonded to three H atoms, and the middle C atom is bonded to two H atoms, showing eight H atoms in total.
ButaneC4H10\text{C}_4\text{H}_{10}C4​H10​Displayed formula of butane: four C atoms in a horizontal row connected by single C-C bonds. The end C atoms are each bonded to three H atoms, and the middle two C atoms are each bonded to two H atoms, showing ten H atoms in total.
a.

the displayed formula representation of one molecule of ethane in box (i).

[1]
b.

the molecular formula of propane in box (ii).

[1]

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