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Question

Select the correct statement(s) with respect to the pπ - dπ dative bond.

A
In (Ph3Si)2O, the Si-O-Si group is nearly linear
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B
Silanols such as (CH3)3SiOH are stronger protonic acids then their carbon analogs
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C
Trisilyl phosphine P(SiH3)3 is planar
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D
ClO4 does not polymerise at all
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Solution

The correct options are
A In (Ph3Si)2O, the Si-O-Si group is nearly linear
B Silanols such as (CH3)3SiOH are stronger protonic acids then their carbon analogs
D ClO4 does not polymerise at all
A) Steric repulsions of bulkier groups and pπ - dπ dative bonding favour for a linear Si-O-Si group.

B) Due to stabilization of the conjugate base anion by pπ - dπ dative bonding between O - Si.

c) It is pyramidal because pπ - dπ bonding is not effective due to bigger size of phosphorus atom.

d) Most effective pπ - dπ overlapping due to small size of chlorine.

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