The least contributing resonating structure of nitroethene is

The decreasing order of bond length of $\mathrm{C}=\mathrm{C}$ bond in the following compounds is:

Which of the following is correct about the following compound

The correct order of $+\mathrm{M}$ effect of $\text{'}\mathrm{N}\text{'}$ containing functional group on the benzene ring, amongst the given compounds is

The correct stability order of given resonating structures is:​​​​​

The longest $\mathrm{C}-\mathrm{N}$ bond length in the given compound is:

Select the correct order of heat of hydrogenation?

 $\left(\mathrm{I}\right)$ 

$\left(\mathrm{II}\right)$ 

$\left(\mathrm{III}\right)$ 

$\left(\mathrm{IV}\right)$