Resonance Effect

Which of the following statements would be true about the below compound?

The most stable canonical structure of this molecule is:

In which of the following molecules / ions resonance structures are equivalent:

There are three canonical structures of naphthalene. Examine them and find the correct statement among the following:

The order of stability of these canonical forms is:

$\left(\mathrm{I}\right){\mathrm{CH}}_3-\mathrm{O}-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}=\mathrm{CH}}_2$

$\left(\mathrm{II}\right){\mathrm{CH}}_3-\mathrm{O}-\stackrel{\oplus }{\mathrm{C}}\mathrm{H}-\mathrm{CH}={\mathrm{CH}-\stackrel{\ominus }{\mathrm{C}}\mathrm{H}}_2$

$\left(\mathrm{III}\right){\mathrm{CH}}_3-\stackrel{\oplus }{\mathrm{O}}=\mathrm{CH}-\mathrm{CH}={\mathrm{CH}-\stackrel{\ominus }{\mathrm{C}}\mathrm{H}}_2$

Among these three canonical structures (through more are possible) what would be their relative contribution in the hybrid?

${\text{C}\text{H}}_2=\text{CH}-\text{C}\text{H}=\text{C}\text{H}-{\text{CH}}_3$ is more stable than ${\text{CH}}_3-\text{CH}=\text{C}=\text{CH}-{\text{CH}}_3$ because

$\begin{array}{cc}\left(\text{I}\right)& {\text{CH}}_2=\underset{\updownarrow }{\text{C}}\text{H}-\text{CH}=\text{CH}-\text{O}{\text{CH}}_3\\ \left(\text{I}\text{I}\right)& \stackrel{\ominus }{\text{C}}{\text{H}}_2-\underset{\updownarrow }{\text{C}}\text{H}=\text{CH}-\text{CH}=\stackrel{\oplus }{\text{O}}{\text{CH}}_3\\ \left(\text{III}\right)& {\text{CH}}_2=\underset{\updownarrow }{\text{C}}\text{H}-\stackrel{\ominus }{\text{C}}\text{H}-\stackrel{\oplus }{\text{C}}\text{H}-\text{O}{\text{CH}}_3\\ \left(\text{IV}\right)& {\text{CH}}_2=\text{CH}-\stackrel{\oplus }{\text{C}}\text{H}-\stackrel{\ominus }{\text{C}}\text{H}-\text{O}{\text{CH}}_3\end{array}$

Among these canonical structures which one is least stable ?

In which of the following molecules - ${\text{NO}}_2$ group is not coplanar with phenyl ring?

Among the following, the least stable resonance structure is

For 1–methoxy–1,3–butadiene, which of the following resonating structure is the least stable?

The decreasing order of the stability of the following resonating structures is

$\underset{\mathrm{I}}{{\mathrm{CH}}_2=\mathrm{CH}-\mathrm{Cl}}\leftrightarrow \underset{\mathrm{II}}{\stackrel{-}{\mathrm{C}}{\mathrm{H}}_2-\mathrm{CH}=\stackrel{+}{\mathrm{C}}\mathrm{l}}\leftrightarrow \underset{\mathrm{III}}{\stackrel{+}{\mathrm{C}}{\mathrm{H}}_2-\mathrm{CH}=\stackrel{-}{\mathrm{C}}}\mathrm{l}$

Which of the following structures of ${\left({\mathrm{CN}}_2\right)}^{2-}$ is incorrect

How many resonating structures are possible in the following structure?

How to recognise if a resonating structure has complete octet?

How many pi electrons does the given molecule have?

The phenoxide ion is more stable than phenol due to _____.

Which of the following resonating structure is most stable?

Write correct stability order of following resonating structure :-
$\left(\mathrm{A}\right) {\mathrm{CH}}_2=\mathrm{CH}-\mathrm{CH}=\ddot{\mathrm{O}}$
${\stackrel{\oplus }{\left(\mathrm{B}\right) \mathrm{CH}}}_2-\mathrm{CH}=\mathrm{CH}-\stackrel{⊝}{\mathrm{O}}$
$\left(\mathrm{C}\right) \stackrel{⊝}{{\mathrm{CH}}_2}-\mathrm{CH}=\mathrm{CH}-\stackrel{\oplus }{\mathrm{O}}$

Most stable resonating structure of formic acid is:-