Writethe and structural forms of the following
names
2 Second member of AlIkene.
Answers
Explanation:
The name of the second member of the alkene series is Propene and its structure is.. Homologous series is a group of organic compounds having similar functional group , represented by sam general formula whose 2 successive members differ by one -CH2 unit.
Explanation:
As noted before, alkenes are hydrocarbons with carbon-to-carbon double bonds (R2C=CR2) and alkynes are hydrocarbons with carbon-to-carbon triple bonds (R–C≡C–R). Collectively, they are called unsaturated hydrocarbons because they have fewer hydrogen atoms than does an alkane with the same number of carbon atoms, as is indicated in the following general formulas:
unsaturated.jpg
Some representative alkenes—their names, structures, and physical properties—are given in Table 13.2.1 .
Table 13.2.1 : Physical Properties of Some Selected Alkenes
ethene
C2H4
CH2=CH2
–169
–104
propene
C3H6
CH2=CHCH3
–185
–47
1-butene
C4H8
CH2=CHCH2CH3
–185
–6
1-pentene
C5H10
CH2=CH(CH2)2CH3
–138
30
1-hexene
C6H12
CH2=CH(CH2)3CH3
–140
63
1-heptene
C7H14
CH2=CH(CH2)4CH3
–119
94
1-octene
C8H16
CH2=CH(CH2)5CH3
–102
121
We used only condensed structural formulas in Table 13.2.1 . Thus, CH2=CH2 stands for
CH2=CH2.jpg
The double bond is shared by the two carbons and does not involve the hydrogen atoms, although the condensed formula does not make this point obvious. Note that the molecular formula for ethene is C2H4, whereas that for ethane is C2H6.
The first two alkenes in Table 13.2.1 , ethene and propene, are most often called by their common names—ethylene and propylene, respectively (Figure 13.2.1 ). Ethylene is a major commercial chemical. The US chemical industry produces about 25 billion kilograms of ethylene annually, more than any other synthetic organic chemical. More than half of this ethylene goes into the manufacture of polyethylene, one of the most familiar plastics. Propylene is also an important industrial chemical. It is converted to plastics, isopropyl alcohol, and a variety of other products.
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