Which compound has the higher melting point? CH33CCH2CHO CH33CCH2CH2OH
Question
Which compound has the higher melting point? CH33CCH2CHO CH33CCH2CH2OH
Solution
The compound with the higher melting point between CH3CCH2CHO and CH3CCH2CH2OH is CH3CCH2CH2OH.
Here's why:
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Both compounds have similar molecular weights, so we need to look at the types of intermolecular forces present in each compound to determine which one has a higher melting point.
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CH3CCH2CHO (propanal) has dipole-dipole interactions due to the presence of a polar carbonyl group (C=O).
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CH3CCH2CH2OH (1-propanol) has hydrogen bonding due to the presence of an -OH group.
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Hydrogen bonding is a stronger intermolecular force than dipole-dipole interactions.
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Therefore, more energy (i.e., a higher temperature) is needed to break the hydrogen bonds in 1-propanol than the dipole-dipole interactions in propanal.
So, CH3CCH2CH2OH (1-propanol) has a higher melting point than CH3CCH2CHO (propanal).
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