Question

Choose the correct option as directed.
A. `CsH gt KH gt NaH gt LiH` (Order of stability)
B. `H_(2)O lt NH_(3)lt CH_(4)` (Order of dipole moment)
C. `PH_(3)lt AsH_(3)lt NH_(3)lt SbH_(3)` (Order of boiling point)
D. `X---H-X, X=O gt F gt N gt S gt Cl` (Order of strength of H-bonding)

Answer 1

Correct Answer - C
`CsH lt KH lt NaH lt LiH`
The stability of the hydrides of the elements from a particular group decreases with increasing atomic number (going down the group).
`CH_(4)lt NH_(3)lt H_(2)O`
Dipole moment depends upon the difference between the electronegativities of the bonded atoms, and the internuclear separation.
`PH_(3)lt AsH_(3)lt NH_(3)lt SbH_(3)`
Boiling point increases with an increase in molecular mass, `NH_(3)` being an exception because of strong hydrogen bonding.
`Cl lt S lt N lt O lt F`
The strength of hydrogen bonding depends upon the electronegativity and the size. Higher electronegativity and smaller size increases the strength of hydrogen bonding.