The colour of the `X_2` molecules of group 17 elements changes gradually from yellow to violet down the group. This is d

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Q 2987656587.     The colour of the `X_2` molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to
JEE 2017 Advanced Paper 1
A

The physical state of `X_2` at room temperature changes from gas to solid down the group

B

Decrease in HOMO-LUMO gap down the group

C

Decrease in `pi^(**)-pi^(**)` gap down the group

D

Decrease in ionization energy down the group

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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