JEE Main 2014 · 11 Apr · Shift 1 · Chemistry Q50

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ChemistrySingle correct+4 / -1Question 50 of 90

Which one of the following does not have a pyramidal shape ?

\ce{(CH3)3N}

\ce{(SiH3)3N}

\ce{P(CH3)3}

\ce{P(SiH3)3}

Answer and worked solution

Official answer: B

In $\ce{(SiH3)3N}$ the nitrogen lone pair is delocalised into silicon, making it planar (trigonal) rather than pyramidal. $\ce{(CH3)3N}$ , $\ce{P(CH3)3}$ and $\ce{P(SiH3)3}$ are pyramidal.

Topics:VSEPR theory Hybridisation

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JEE Main 2014 · 11 Apr · Shift 1, Chemistry question 50