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  • Which among the following molecular hydrides acts as a lewis base? <img alt="\mathrm{A. \, \, \mathrm{CH}_4}" src="/latex-image/?%5Cmathrm%7BA.%20%5C%2C%20%5C%2C%20%5Cmathrm%7BCH%7D_4%7D"

Which among the following molecular hydrides acts as a lewis base?

\mathrm{A. \, \, \mathrm{CH}_4}

\mathrm{B. \, \, \mathrm{NH}_3}

\mathrm{C. \, \, \mathrm{H}_2 \mathrm{O}}

\mathrm{D. \, \, \mathrm{B}_2 \mathrm{H}_6}

Option: 1

A & B Only


Option: 2

B only


Option: 3

B & C only


Option: 4

D only


Answers (1)

best_answer

Molecular hydrides may be categorized into –
a. Electron-rich hydrides
b. Electron-precise hydrides
c. Electron-deficient hydrides

Electron rich hydrides are the hydrides which have one or more lone pairs of electrons around the central more electronegative element. They act as lewis base.
Examples: \mathrm{H}_2 \mathrm{O}, \mathrm{NH}_3, \mathrm{HF}

Electron precise hydrides are the hydrides which have the required number of electrons to write their conventional Lewis structures. Elements of group 14 form such hydrides.

Example: \mathrm{CH}_4

Electron deficient hydrides are the hydrides which have lesser number of electrons than that required for completing the octet. They act as lewis acids.
Example: \mathrm{B}_2 \mathrm{H}_6

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