
Concept explainers
Interpretation:
From the options given below, the one that best describes the difference between sigma bond and pi bond has to be identified.
- (a) A sigma bond is a bonding molecular orbital; a pi bond is an anti-bonding molecular orbital.
- (b) A sigma bond is a single bond whereas a pi bond is a double bond.
- (c) The electron density in the sigma bond lies along the internuclear axis; that of a pi bond doesn’t.
Concept Introduction:
Hybridization is a hypothetical concept. It refers to overlapping of atomic orbitals and the resultant orbitals formed are known as hybrid orbitals. After hybridization, the orbitals cannot be distinguished individually. The orientation of the orbitals while overlapping impacts the nature of the bond forms.
A bond between two atoms is known as sigma bond if the atomic orbitals of the atoms overlap end to end – it is also called head on overlapping. A bond is said to pi bond if it is formed by sideways overlapping of atomic orbitals of the atoms.
Correct answer:
The option (c) – “The electron density in the sigma bond lies along the internuclear axis; that of a pi bond doesn’t” best describes the difference between sigma bond and pi bond.
Reason for correct option:
In sigma bond formation, the head on overlapping of atomic orbitals causes electron density to be cylindrically symmetrical about inter-nuclear axis.

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Chapter 7 Solutions
Chemistry Atoms First, Second Edition
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- Identify the missing organic reactant in the following reaction: x + x O OH H* + ☑- X H+ O O Х Note: This chemical equation only focuses on the important organic molecules in the reaction. Additional inorganic or small-molecule reactants or products (like H₂O) are not shown. In the drawing area below, draw the skeletal ("line") structure of the missing organic reactant X. Click and drag to start drawing a structure. Carrow_forwardCH3O OH OH O hemiacetal O acetal O neither O 0 O hemiacetal acetal neither OH hemiacetal O acetal O neither CH2 O-CH2-CH3 CH3-C-OH O hemiacetal O acetal CH3-CH2-CH2-0-c-O-CH2-CH2-CH3 O neither HO-CH2 ? 000 Ar Barrow_forwardWhat would be the best choices for the missing reagents 1 and 3 in this synthesis? 1. PPh3 2 2. n-BuLi 3 Draw the missing reagents in the drawing area below. You can draw them in any arrangement you like. • Do not draw the missing reagent 2. If you draw 1 correctly, we'll know what it is. • Note: if one of your reagents needs to contain a halogen, use bromine. Explanation Check Click and drag to start drawing a structure.arrow_forward
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