1.

Which of the following statement is /are correct ?

Answer»

Out of trimethylamine and trimethylphsophine , trimethylamine has higher DIPOLE moment
Out of `(SiH_3)_2O` and `(CH_3)_2O, (SIH_3)_2O` is more basic
C-C bond length (in pm) in `C_2` molecule is greater than O-O bond length in `O_2` molecule
`N(SiMe_3)_3` and `BF_3` molecules are isostructural

Solution :Nitrogen is more electronegative than phosphorus.

So, dipole moment of trimethylamine is greater than trimethyl phosphaine.

In trisilyl ether the lone pair of electron on oxygen atom is LESS easily available for donation because of `ppi-dpi` DELOCALISATION DUE to presence of the vacant d-orbital with Si.This however is not possible with carbon in `CH_3-C-CH_3` due to the absence of d-orbital making it more basic.
(C )Bond order of `C_2` and `O_2` are same i.e. 2. In `C_2` molecules both bonds are `pi`-bonds whereas, there is one `sigma` and one `pi` bonds in `O_2` molecule.
`C_2`=131 pm , `O_2`=121 pm .
(D)


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