Match the halogens (P) F2, (Q) Cl2, (R) Br2, (S) I2 with their colours: (1) violet, (2) reddish brown, (3) pale yellow, (4) greenish yellow.

JEE Main levelSingle correct optionDifficulty 2 of 3ph020

Match the halogens (P) $F X_{2}$ , (Q) $Cl X_{2}$ , (R) $Br X_{2}$ , (S) $I X_{2}$ with their colours: (1) violet, (2) reddish brown, (3) pale yellow, (4) greenish yellow.

F X_{2}

is pale yellow,

Cl X_{2}

greenish yellow,

Br X_{2}

reddish brown and

I X_{2}

violet. The colour deepens down the group as the energy gap for electronic excitation decreases.