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Chemistry 21 Online
OpenStudy (asbhardwaj18):

why BF3 is a poor lewis acid than BCl3 ?

OpenStudy (aaronq):

What characteristic defines the strength of a lewis acid?

OpenStudy (asbhardwaj18):

tendency to accept a lone pair >

OpenStudy (aaronq):

so, with that in mind and knowing that the B-F bond is much shorter than then B-Cl bond...What effect do you think lone pairs of F will have on the ability for B to accept more electrons?

OpenStudy (asbhardwaj18):

F will loose lone pair ... itself and does p pi - p pi back bonding

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