The $C-C$ bond length of the following molecules is in the order:

The types of hybridisation on the five carbon atoms from left to right in $pent-1-en-4-yne$ are

What is the correct mode of hybridization of the central atom in the following compounds: $NO_2^+$,$SF_4$,$PF_6^-$?

Choose the correct code of characteristics for the given order of hybrid orbitals of the same atom,$sp < sp^2 < sp^3$:
$(i)$ Electronegativity
$(ii)$ Bond angle between same hybrid orbitals
$(iii)$ Size
$(iv)$ Energy level

The type of hybridisation of boron in diborane $(B_2H_6)$ is:

What is the structure of $CH_2 = C = CH_2$?