The functional group that shows negative resonance effect is :

The number of radial node/s for $3 p$ orbital is :

Which among the followng has highest boiling point?

Given below are two statements :

Statement (I) : A $\pi$ bonding MO has lower electron density above and below the inter-nuclear axis.

Statement (II) : The $\pi^*$ antibonding MO has a node between the nuclei.

In the light of the above statements, choose the most appropriate answer from the options given below :