Why is that tertiary alcohols show greater reactivity towards hydrogen halides than secondary and primary alcohols?

How is glycerol obtained commercially? State its uses.

Give a brief account of the following reaction: Etherification.

Identify the isomerism in each of the following pairs.
CH₃OCH₂OCH₃ and CH₃OCH₂CH₂OH
CH₃CH(OH)CH₂OH and CH₂OHCH₂CH₂OH
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }-OH\) and CH₃-CH₂-CH₂-CH₂OH

Give the IUPAC names of each of the following and classify them as 1°, 2° and 3°
(a) CH₃(CH₂)₃CHOHCH(CH₃)₂
(b) (CH₃)₃C-CH₂OH
(c) \(({ CH }_{ 3 })_{ 2 }\underset { \overset { | }{ { C }_{ 6 }{ H }_{ 5 } } }{ C } -OH\)
(d) \(BrCH_{ 2 }-\underset { \overset { | }{ OH } }{ { CH }_{ 2 } } -CH-C({ CH }_{ 3 })_{ 3 }\)
(e) CH₂=CH-CHOHCH
(f) PhCH₂OH
(g) HOCH₂CH₂CH₂CH₂C₆H₅
(h) (C₂H₅)₃COH