The enolic form of ethyl acetoacetate as below has

• 18 sigma bonds and 2 pi-bond

• 16 sigma bonds and 1 pi-bond

• 9 sigma bonds and 2 pi-bond

• 9 sigma bonds and 2 pi-bond

Which of the following molecules has the maximum dipole moment?

• CO₂

• CH₄

• NH₃

• NH₃

Which one of the following species has the plane triangular shape?

• N₃

• NO₃^-

• NO₂^-

• NO₂^-

The total number of Pi bond electrons in the following structure is

• 4

• 8

• 12

• 12

The pair of compounds that can exist together is 

• FeCl₃.SnCl₂

• HgCl₂,SnCl₂

• FeCl₂,SnCl₂

• FeCl₂,SnCl₂