Q. 104.1( 25 Votes )

Do you expect the carbon hydrides of the type (CnH2n + 2) to act as ‘Lewis’ acid or base? Justify your answer.

Answer :

For carbon hydrides of type CnH2n+2, the following hydrides are possible for

n=1, CH4


n=2, C2H6


The hydride acts as Lewis acid only when the hydride is deficit of electrons and then only it will have the tendency to accept electrons.


Taking C2H6 as an example,


the total number of electrons are 14 and the total covalent bonds are seven. Hence, the bonds are regular 2e- -2 centred bonds.


14360284044016.jpg


Hence, hydride C2H6 has sufficient electrons to be represented by a conventional Lewis structure. Therefore, Ethane is an electron-precise hydride, having all atoms with complete octets. Thus, it can neither donate nor accept electrons to act as a Lewis acid or Lewis base.


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