Consider the following molecules.
1. BF3
2. NH3
3. SOCI₂
4. SiF4
Which of these should have a dipole moment?
A. 2 only
B. 2, 3 and 4 only
C. 1, 2 and 3 ony
D. 1 and 4 only
E. 2 and 3 only

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