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3 Alkanes The family of alkanes forms such a homologous series, the constant difference between successive members being (CH 2 ). hydrogen atoms equals two more than twice the number of carbons atoms. formula for this series is: C n H 2n+ 2. Alkanes The family of alkanes forms such a homologous series, the constant difference between successive members being (CH 2 ). hydrogen atoms equals two more than twice the number of carbons atoms. formula for this series is: C n H 2n+ 2.
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Organic chemistry
Assistance Lecturer Amjad Ahmed Jumaa
Alkyl group
alkane
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Alkyl groups A primary carbon directly attached to one other carbon. A secondary carbon directly attached to two other carbon .A tertiary carbons to three other carbons.
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Alkanes The family of alkanes forms such a homologous series, the constant difference between successive members being (CH2). hydrogen atoms equals two more than twice the number of carbons atoms. formula for this series is: CnH2n+ 2.
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The alkane's methane, ethane, propane, butane, and pentane have respectively one, two, three, four, and five carbon atoms. We also see the names are derived from the Greek (or Latin) prefix for the particular number of carbons in the alkanes: Pentane = for five carbon atoms. Hexane = for six carbon atoms. Heptane = for seven carbon atoms. Octane= for eight carbon atoms. And so on.
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Problem: when n=5 give the name of the alkane and write its structure? Solution: according to the general formula CnH2n+ 2.
Cx5 H2x5+2
C5H12. The alkane is pentane .and the structure is: CH3CH2CH2CH2CH3
Follow problem: give the structural formula and the name for the alkane when n=9
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Follow problem: give the structural formula and the name for the alkane when n=6
Follow problem: for structural formula: CH3CH2CH3 write the general formula? Then determine the ( n value).
