Ok...
someone please help me out in knowing the general rules and/ or trends for identifying:
1. Acidity
2. Basicity
3. Boiling point
4. Melting point of a compound, please.
For example, The more substituted a compound is, the higher boiling point it will have, etc
Thanks!
groups that increase basicity:
DEstabilize the lone e pair (usually 2 donating groups)
groups that increase acidity: electron withdrawing groups (groups that can STABILIZE the resulting neg. charge after losing a proton) eg: conjugated systems, highly electronegative atoms, etc
Boiling point: when external pressure = vapor pressure
higher MW = higher BP,
more branching = lower BP, MP (london dispersion forces weaker because molecules are "stacked" more loosely due to branching)
hydrogen bonding = higher BP, MP (remember, only NH, OH, and FH are capable of H bonding)
cis/trans: cis isomers will have a higher BP than trans isomers because cis isomers are
more polar. Trans isomers will have a higher melting point because their conformation allows them to be "stacked" more tightly, their symmetry generally allows better packing in the solid state
ionic compounds will have a higher melting point than covalent compounds due to ionic interactions
Hope tihs was helpful, feel free to correct me if I got something wrong!