Larger molecules often have several structural isomers that are possible. When o

Question

Larger molecules often have several structural isomers that are possible. When only one specific isomer is being discussed condensed formulas are often used to provide more information about the molecule than can be provided by the molecular formula alone. In these condensed formulas, the atoms are listed in the order that they are connected. For example CH,CH,CH,OH, means that you have three carbons in a row with an OH on the end, while CH,CHOHCH, indicates that the OH is connected to the second. Note: the hydrogens always follow the atom that they are connected to. 5. CH,CH2CH2OH CH,CHOHCH, Laboratory 12 | Chemicaf Bonding 127

Explanation / Answer

Both the alcohols (CH3CH2CH2OH and CH3CHOHCH3) have the same molecular formulae but they differ in the connectivity of OH-group.

Hence the given alcohols (CH3CH2CH2OH and CH3CHOHCH3) are said to be structural isomers.

The first one is a primary alcohol (OH group-connected carbon is attached to only one carbon), whereas the second one is a secondary alcohol (OH group-connected carbon is attached to two carbons).

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