Special Types of Bonding

The phosphate inhibition in the clavine formation with Claviceps SD58, can be counteracted by the addition of

Which of the following species will not show $\mathrm{d}$-orbital resonance?

Correct order of strength of $\mathrm{\pi }$ - bond(s) are:

I) ${\mathrm{BO}}_3^{3-}>{\mathrm{CO}}_3^{2-}>{\mathrm{NO}}_3^{-}$

II) ${\mathrm{ClO}}_4^{-}>{\mathrm{SO}}_4^{2-}>{\mathrm{PO}}_4^{3-}$

III) ${\mathrm{BF}}_3>{\mathrm{BCl}}_3>{\mathrm{BBr}}_3$

IV) ${\mathrm{AlCl}}_3>{\mathrm{BCl}}_3$

Which among the following has $3\mathrm{C}-4{\mathrm{e}}^{-}$bond?

Cotyledons are also called-