Download Chem 3.5 Answers #3

CHEMISTRY 3.5
ANSWERS
ORGANIC
WORKSHEET THREE
1.
(a)
2.
CH3CH2CH2OH
3.
Ethanoic acid and propanone
4.
(a)
5.
Tertiary
Primary
6.
(a)
(b)
(c)
CH3CH(OH)CH2CH3
CH3CH2CH2OH and CH3CH(OH)CH3
CH3CH(OH)CH3
7.
(a)
(b)
Boiling point increases with increasing molecular mass.
The presence of the OH group on propanol allows hydrogen bonding to
occur between propanol molecules. The attractions between propane
molecules are weak Van der Waals forces and so the energy needed to
separate its molecules from each other is much less giving a lower B. Pt.
The OH bond allows the alcohol molecules to hydrogen bond to water
molecules making them soluble. For larger molecules the increasing
alkyl chain makes this less effective.
(c)
hex-2-ene
Butanol
(b)
Alkenes & Alcohols
2-methylpent-2-ene
Conc. H2SO4
(b)
Secondary
Tertiary
CH3CH=CH2
+ H2O
3-methylbutan-2-ol
Secondary
Secondary
8.
(a)
(b)
(c)
(d)
CH3CH2CH2Cl + HCl(g)
PCl3
CH3CH2Cl + SO2(g) + HCl(g)
The product is pure and does not need to be separated from other
products.
9.
(a)
(b)
(c)
Catalyst
ZnCl2/ HCl
CH3CH(OH)CH3
CH3CHClCH3
Tertiary alcohols react fastest, followed by secondary. Primary are the
slowest.