QQuestionChemistry
QuestionChemistry
Draw the Lewis structure of acetaldehyde (CH₃CHO) and then choose the appropriate pair of molecular geometries of the two central atoms.
a) tetrahedral / trigonal pyramidal
b) trigonal planar / linear
c) tetrahedral / trigonal planar
d) trigonal / tetrahedral
e) planar / trigonal planar
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Answer
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Step 1:I'll solve this step by step with proper LaTeX notation:
Step 2:: Identify the atoms and their valence electrons
- Hydrogen atoms: $$1 valence electron each
- Carbon 2 (right carbon): 4 valence electrons
Step 3:: Draw the skeletal structure
- Connect the carbons with a single bond - Attach hydrogens to the left carbon - Attach oxygen to the right carbon with a double bond
Step 4:: Distribute electrons to satisfy octet rule
- Left carbon will have 4 bonds (tetrahedral geometry) - Right carbon will have 3 bonds and 1 lone pair on oxygen (trigonal planar geometry)
Step 5:: Analyze molecular geometries
- Left carbon: 4 bonds around carbon = $$tetrahedral
- Right carbon: 3 bonds + 1 lone pair = trigonal planar
Final Answer
Option c) tetrahedral / trigonal planar
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