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प्रश्न
Molecular hydrides are classified as electron-deficient, electron precise and electron-rich compounds. Explain each type with two examples.
उत्तर
Covalent or molecular hydrides are classified into three categories:
(i) Electron deficient hydrides: These hydrides do not have sufficient number of electrons to form normal covalent bonds. Examples are the hydrides of group 13 such as \[\ce{B2H6, (AlH3)n}\] etc.
(ii) Electron precise hydrides: These have exact number of electrons to form normal covalent bonds. Examples are the hydrides of group 14 such as \[\ce{CH4, SiH4}\], etc.
(iii) Electron rich hydrides: These have more number of electrons than normal covalent bonds. The excess electrons are present in the form of lone pairs. Examples are the hydrides of group 15, 16 and 17 such as
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संबंधित प्रश्न
What do you understand by electron-rich compounds of hydrogen? Provide justification with a suitable example.
What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactions?
Do you expect the carbon hydrides of the type (CnH2n + 2) to act as ‘Lewis’ acid or base? Justify your answer.
Arrange the following:
LiH, NaH and CsH in order of increasing ionic character.
What do you understand by electron-deficient? Provide justification with a suitable example.
What do you understand by electron-precise? Provide justification with a suitable example.
Name the classes of hydrides to which \[\ce{H2O, B2H6}\] and \[\ce{NaH}\] belong.
What do you understand by the term ‘auto protolysis of water’ ? What is its significance?
Hydrogen generally forms covalent compounds. Give reason.
An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write the formula of this hydride. Write its reaction with \[\ce{Al2Cl6}\].
