Anomalous behaviour of the first member (oxygen, fluorine) and its causes

1. A.
   It is highly electronegative element.
2. B.
   It exhibits only - 1 oxidation state.
3. C.
   It has high bond dissociation enthalpy among all halogens.
4. D.
   It form only one oxoacid.

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1. A.
   (A), (B), (C) and (E) only.
2. B.
   (A), (B) and (D) only.
3. C.
   (A), (B), (C) and (D).
4. D.
   (B), (C) and (D) only.

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1. A.
   $\mathrm{F}$
2. B.
   $\mathrm{Cl}$
3. C.
   $\mathrm{Br}$
4. D.
   $\mathrm{I}$

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