F is more electro-ve than other atom..so it will attract more effectively the elctrons on N atom...as N atom in NF3 will be electron deficient most so lone pair will not be avalable for donation & hence its least basic..
padhna likhna chad de mitra , nakal te rakhi aas , chak chaddar te so ja bhagta , Rabb karega tennu paas.....
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