In this question, Q represents an atom of chlorine, bromine or iodine.
Which explanation for the variation in volatility down Group 17 is correct?
Instantaneous dipole–induced dipole forces between molecules become stronger.
2 )
Permanent dipole–permanent dipole forces between molecules become stronger.
3 )
The bond energy of the Q$_2$ molecules decreases.
4 )
The first ionisation energy Q(g) $\to$ Q${^ + }$(g) + e${^ - }$ decreases.
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