According to the $VB$ theory,when is a bond not formed between two atoms? Give examples.
(N/A) According to the $VB$ theory,a bond is not formed if the two atomic orbitals are not oriented along the common internuclear axis,as this leads to zero overlap.
Examples:
$1$. The overlap between an $s$-orbital and a $p_x$-orbital oriented perpendicular to the internuclear axis ($z$-axis) results in zero overlap.
$2$. The overlap between a $p_x$-orbital and a $p_y$-orbital oriented along the same internuclear axis ($z$-axis) also results in zero overlap.
Examples:
$1$. The overlap between an $s$-orbital and a $p_x$-orbital oriented perpendicular to the internuclear axis ($z$-axis) results in zero overlap.
$2$. The overlap between a $p_x$-orbital and a $p_y$-orbital oriented along the same internuclear axis ($z$-axis) also results in zero overlap.
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Similar Questions
Where is the nodal plane of the $\pi$-bond in ethene located?
Medium
View SolutionMatch the orbital overlap figures shown in List-$I$ with the description given in List-$II$ and select the correct answer using the code given below the lists.
List-$I$:
$P$. Two $d$-orbitals overlapping axially with same phase.
$Q$. $A$ $p$-orbital and a $d$-orbital overlapping laterally with same phase.
$R$. $A$ $p$-orbital and a $d$-orbital overlapping laterally with opposite phase.
$S$. Two $d$-orbitals overlapping axially with opposite phase.
List-$II$:
$1$. $p-d$ $\pi$ antibonding
$2$. $d-d$ $\sigma$ bonding
$3$. $p-d$ $\pi$ bonding
$4$. $d-d$ $\sigma$ antibonding
Codes: $P \quad Q \quad R \quad S$
List-$I$:
$P$. Two $d$-orbitals overlapping axially with same phase.
$Q$. $A$ $p$-orbital and a $d$-orbital overlapping laterally with same phase.
$R$. $A$ $p$-orbital and a $d$-orbital overlapping laterally with opposite phase.
$S$. Two $d$-orbitals overlapping axially with opposite phase.
List-$II$:
$1$. $p-d$ $\pi$ antibonding
$2$. $d-d$ $\sigma$ bonding
$3$. $p-d$ $\pi$ bonding
$4$. $d-d$ $\sigma$ antibonding
Codes: $P \quad Q \quad R \quad S$
MediumIIT 2014
View SolutionWhat is the number of $\pi$ bonds and $\sigma$ bonds respectively in the given structure?
Easy
View SolutionState the number of $\sigma$ and $\pi$ bonds in the following molecules:
$(a)$ $C_2H_2$
$(b)$ $C_2H_4$
$(a)$ $C_2H_2$
$(b)$ $C_2H_4$
Medium
View SolutionWhich type of orbitals overlap with each other in benzene?
Medium
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