In which of these molecules or ions does the presence of nonbonding electron pairs produce an effect

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In which of these molecules or ions does the presence of nonbonding electron pairs produce an effect on molecular shape, assuming they are all in the gaseous state?
(a) SiH4,
(b) PF3,
(c) HBr,
(d) HCN,
(e) SO2.
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Chemistry The Central Science

ISBN: 978-0321696724

12th edition

Authors: Theodore Brown, Eugene LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward

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