Question

becl2 is linear wle pbcl2 is angular why?

Answer 1

It is due to the hybridization pattern, 

Actually in case of BeCl2 , 

Total no. of valence electron = 2 (for Be) + 7x 2 ( for Cl) = 16

Bond pair = 2

No. of electrons used in forming the octets and duet = 8 x2 = 16

So, lone pair = 0 

hence, hybridization = sp and shape = linear 

While in case of SnCl2 , 

Total no. of valence electron = 4 (for Sn) + 7x 2 ( for Cl) = 18

Bond pair = 2

No. of electrons used in forming the octets and duet = 8 x2 = 16

So, lone pair = 1

hence, hybridization = sp  but, shape for the molecule changes to angular i.e. V-shaped(due to one lone pair).

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