QAIPMT-2010-Ch-1934: NEET 2010 Chemistry - Class 11 AIPMT-2010-Ch-1934 Solution: In which of the following molecules the central atom does not…

For neutral molecules No. of electron pairs = No. of atoms bonded to it + 1/2[Gp. no. of central atom - Valency of central atom] _ For CH 4 , no. of e - pairs = 4 + 1/2[4 - 4] = 4 (sp 3 hybridisation) For SF 4 , no. of e - pairs = 4 + 1/2[6 - 4] = 5 (sp 3 d hybridisation) and For ions, No. of electron pairs = No. of atoms bonded to it + 1/2[Gp. no. of central atom - Valency of central atom � No. of electrons] _ For BF 4 - , no. of e - pairs = 4 + 1/2[3 - 4 + 1] = 4 (sp 3 hybridisation) For NH 4 + , no. of e - pairs = 4 + 1/2[5 - 4 - 1] = 4 (sp 3 hybridisation)