The structure of methanal is shown. Which diagram shows the arrangement of outer shell electrons in a molecule of methanal?
A.
B.
C.
D.
Exam No：0620_w16_qp_22 Year：2016 Question No：6
Answer:
C
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
2.5.1. State that a covalent bond is formed when a pair of electrons is shared between two atoms leading to noble gas electronic configurations
2.5.2. Describe the formation of covalent bonds in simple molecules
2.5.3.1. low melting points and boiling points
2.5.3.2. poor electrical conductivity
2.5.4. Describe the formation of covalent bonds in simple molecules
2.5.5.1. low melting points and boiling points in terms of weak intermolecular forces (specific types of intermolecular forces are not required)
2.5.5.2. poor electrical conductivity
Solution:
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