Which of the following molecules has a dipole | vedclass

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(C) The dipole moment $(\mu)$ of a molecule is zero if it has a symmetric geometry where the bond dipoles cancel each other out.
$BH_3$ and $AlH_3$ h

Vedclass · Accepted Answer

$BH_3$

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(C) The dipole moment $(\mu)$ of a molecule is zero if it has a symmetric geometry where the bond dipoles cancel each other out.
$BH_3$ and $AlH_3$ have a trigonal planar geometry ($sp^2$ hybridization),which is symmetric,resulting in a net dipole moment of $\mu = 0$.
$NH_3$ and $PH_3$ have a trigonal pyramidal geometry with a lone pair on the central atom,which is asymmetric,resulting in a non-zero dipole moment $(\mu 
eq 0)$.
Therefore,both $BH_3$ and $AlH_3$ have a dipole moment of zero. Given the options,$BH_3$ is the standard answer.

Which of the following molecules has a dipole moment of zero: $NH_3, PH_3, BH_3, AlH_3$?

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