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Super octet molecule is...

Super octet molecule is

A

`F_(3)Cl`

B

`PCl_(3)`

C

`NH_(3)`

D

None of these

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Which of the following is an example of super octet molecule ?

Lewis concept of covalency of an element involved octet rule .Later on it was found that many elements in their compoinds e.g, BeF_2,BF_3 etc . Have incomplete octet whereas PCl_5 ,SF_6 etc , have expanded octet . This classical conept also failed in predicting the geometry of molecules .Modern concept of covalence was propsed in terms of valence bond theory proposed by Heitler and London and later on modified by Pauling nad Slater . Hybridisation concept alongwith valence bond theory although successfully explained the geometry of various molecules but failed in many molecules . the geometry of such molecules was explained by VSEPR concept . Finally molecular orbital theory was porosed by Hund -Mulliken to explain many other anomalies .. Which statements are correct ? (1) Bond angle of PF_(3) gt PCl_(3) . (2) Bond angle of PCl_(3) lt PBr_(3) (3) (CH_(3))_(3)N is pyramidal whereas (SiH_(3))_(3)N is planar but both shows sp^(3) -hybridisation. (4) Multiple bonds also influence the geometry of molecule and thus C_(2)H_(2) has angleHCH=160^(@) and angleHCO=122^(@) (5) PCl_(5) is super-octet molecule

Assertion : In the formation of water octet molecule, both hydrogen and oxygen atoms attain octet of electrons. Reason : Oxygen atom forms two ionic or electrovalent bonds with two hydrogen atoms.

Statemet : IF_7 is super-ociet molecule . Explanation : central atom of I in IF_7 has 14 electrons .

Assertion : PF_(5),SF_(6)and H_(2)SO_(4) are the examples of expanded octet molecules . Reason : Octet rule is not applicable to the second period elements of the periodic table.

Which of the following covalent molecule is an exception to octet rule ?