Compare the dipole moments of (i) methanol, (ii) phenol and (iii) dimethyl ether.

Which has higher boiling point ? (I) Phenol (II) Benzenethiol b. Which has higer melting point ? (I) Hydroquinone (II) Catechel c. Explain the less solubility and lower boiling point of: (I) 0-Nitrophenol (II) 0-Hydroxy benzaldehyde (III) 0-Hydroxybenozioc acid (salicylic acid) compared with their p- and m- isomers. d. Which isomer (o, m-, or p) of hydroxy acetophenone is steam volatile ? e. Which of the following shows chelation ? (I) 0-Cresol (II) Oil of wintergreen (III) 0-lodo phenol (IV) 0-Fluoro phenol (V) 0-Cyano phenol f. Why are the dipole moments of phenol 1.7 D) and methanol (1.6 D) in opposite direction ? g. Why is the dipole moment of p-nitro phenol (5.0 D) is reater than of nitro benzene (4.0 D) or phenol ? h. Why is the (C----O) bond in alcohol larger than in phenol ? i. Compare the boiling points and water solubilities of phenol and toluene. j. Why are monophenolic compounds (e.g., cresols) are insoluble in H_(2)O ? k. Which is more soluble in H_(2)O : hexanol (I) or cyclohexanol (II) ?

What type of isomersm exists between the following pairs of compounds ? (i) Pentan-1-ol and 3-Methylbutan-1-ol (ii) Ethanol and Dimethyl ether (iii) Butan-1-ol and Butan-2-ol

Dipole moment of phenol is smaller than that of methanol. Why ?