Ethanol, $$\(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)$$, is a member of the alcohol homologous series. Give two characteristics of a homologous series. 1 2
Exam No：0620_w11_qp_23 Year：2011 Question No：7(a)(i)
Answer:
Any two of:
have same general formula / have same pattern of formula / members differ by \(\mathrm{CH}_{2}\) group
have same functional group
have similar chemical properties / prepared by similar methods
allow: same chemical properties
not: similar properties
show gradual change in physical properties / show trend in boiling points
have same general formula / have same pattern of formula / members differ by \(\mathrm{CH}_{2}\) group
have same functional group
have similar chemical properties / prepared by similar methods
allow: same chemical properties
not: similar properties
show gradual change in physical properties / show trend in boiling points
Knowledge points:
11.1.1. Draw and interpret the displayed formula of a molecule to show all the atoms and all the bonds
11.1.2.1. alkanes
11.1.2.2. alkenes
11.1.2.3. alkenes
11.1.2.4. carboxylic acids
11.1.3. Identify a functional group as an atom or group of atoms that determine the chemical properties of a homologous series
11.1.4. State that a homologous series is a family of similar compounds with similar chemical properties due to the presence of the same functional group
11.1.5. State that a saturated compound has molecules in which all carbon–carbon bonds are single bonds
11.1.6. State that an unsaturated compound has molecules in which one or more carbon–carbon bonds are not single bonds
11.1.7. State that a structural formula is an unambiguous description of the way the atoms in a molecule are arranged
11.1.8. Define structural isomers as compounds with the same molecular formula, but different structural formulae
11.1.9.1. having the same functional group
11.1.9.2. having the same general formula
11.1.9.3. differing from one member to the next
11.1.9.4. displaying a trend in physical properties
11.1.9.5. sharing similar chemical properties
Solution:
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