Among $O, C, F, Cl, Br$ the correct order for increasing radii is

$F, O, C, C l, B r$

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$F, C, O, C l, B r$

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$F, C l, B r, O, C$

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$C, O, F, C l, B r$

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Solution

The correct option is A
$F, O, C, Cl, Br$

Explanation for correct option:
(A)
On moving down the group, atomic size increases. Out of the elements given, three belong to the halogen family. Thus, the trend for increasing atomic radii for halogen will be: $Br > Cl > F$ while Carbon and Oxygen both are members of the second period.
On moving across a period, atomic size decreases. Thus, the size will be: $C > O > F$ . The size of carbon is smaller than that of chlorine and bromine as it belongs to the second period and the latter ones belong to the third period.
Thus, the correct order is: $F, O, C, Cl, Br$
Explanation for incorrect options:
Since the trend for increasing atomic radii is $F, O, C, Cl, Br$ . Thus, all the other options (B), (C), and (D) stand incorrect.
Therefore, the correct option is (A). The correct order for increasing radii is $F, O, C, Cl, Br$ .

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