Conjugated double bond is present in:

Conjugated double bonds are present in :

Double bonds are present in

Double bonds are present in

the double bonds are

Pure covalent double bond is present in

Mesomeric effect involves delocalisation of pi-electrons of all the double bonds present in a conjugated system.

How many single and double bonds are present in cyclotrimetaphosphoric acid ?

How many single and double bonds are present in the molecule of benzene (C_(6)H_(6)) ?