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  • Which among the following molecular hydrides acts as a lewis acid?Option: 1 <img alt="\mathrm{B}_2 \mathrm{H}_6" src="https://entrancecorner.oncodeco

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

Option: 1

\mathrm{B}_2 \mathrm{H}_6


Option: 2

\mathrm{CH}_4


Option: 3

\mathrm{NH}_3


Option: 4

\mathrm{H}_2 \mathrm{O}


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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