What is structure (CF3)2-Al-O-Al-(CF3)2 and also find the number of pi bond or Back bond?

Generally neutral atom donates only one lone pair to back bonding because after that, electron density on that atom itself highly reduced but the compound [(CF₃)₂-Al-O-Al-(CF₃)₂] is a rare example of two lone pair donation.

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What are the structure of (1) N(SiH3)3 (2) {(Me)3Si}2N-Si(Me)3 (3) HN(SiH3)2 and give the Answers of following questions?

 

Q (1): which is greater x or y?
Q (2): which is greater x or z?
Q (3): which have greater extent of back Bonding?

SOLUTION:

Ans: (1): ‘y’ is greater than ‘x’ because of steric repulsion of -CH₃ group.

Ans: (2): “z’ will be greater because one lone pair going two places.

Ans; (3): the extant of back bonding is 3^rd >1^st > 2nd