In allene $(C_3H_4)$,the type of hybridization of the carbon atoms is (are)

The incorrect statement regarding the $BF_2NH_2$ molecule is:

Which type of hybridisation occurs in ethylene?

$KI + MnO_2 + H_2SO_4 \to$ Vapours $(B) +$ other products
Vapours $(B) + K_2S_2O_8 \to (C) + (D)$
$(D) \xrightarrow{(B)}$ Brown $(E)$
Hybridisation of central atom in $(E)$ is

The shape of the $C_2H_4$ (ethene) molecule is.......

Define the following terms:
$(i)$ Hybridisation
$(ii)$ $sp$ Hybridisation
$(iii)$ $sp^2$ Hybridisation
$(iv)$ $sp^3$ Hybridisation
$(v)$ Hydrogen bonding