Choose the correct option as directed.

1.	Choose the correct option as directed.
Answer» `CsH gt KH gt NaH gt LIH` (Order of stability) `H_(2)O lt NH_(3)lt CH_(4)` (Order of dipole moment) `PH_(3)lt AsH_(3)lt NH_(3)lt SbH_(3)` (Order of boiling point) `X---H-X, X=O gt F gt N gt S gt Cl` (Order of strength of H-bonding) Solution :`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.

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