Give reason for the following :

Water molecule has bent structure whereas carbon dioxide molecule is linear.

Give reason for the following :

Ethyne molecule is linear.

Arrange the following bonds in order of increasing ionic character giving reason.

$\mathrm{N}—\mathrm{H}, \mathrm{F}—\mathrm{H}, \mathrm{C}—\mathrm{H} \mathrm{and} \mathrm{O}—\mathrm{H}$

Predict the hybridisation of each carbon in the molecule of organic compound given below. Also indicate the total number of sigma and pi bonds in this molecule.

Group the following as linear and non-linear molecules :

${\mathrm{H}}_2\mathrm{O}, \mathrm{HOCl}, {\mathrm{BeCl}}_2, {\mathrm{Cl}}_2\mathrm{O}$

Elements $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ have $4, 5$ and $7$ valence electrons respectively.

(i) Write the molecular formula of the compounds formed by these elements individually with hydrogen.

Elements $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ have $4, 5$ and $7$ valence electrons respectively.

Which of these compounds will have the highest dipole moment?