1ya in SO42- sulfur forms double bonds with oxygen.... not dative bonds..
infact all the options are hypervalent....
1.hypervalent compound is(are):-
A.SO3-2
B.PO4-3
C.SO4-2
D.ClO4-1
what r hypervalent compounds?
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17 Answers
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11Well if you see, all the options are hypervalent, so I think they all are hypervalent compounds.
@ Vivek, if I am not ignorant, arihant mein hypervalency ke bare mein kuchh nahi hai
71Hahaha!! @Khyati I think ClO4- is also among the answer.
Sorry But I don;t have Arihant's any Chemistry book!
11@ Vivek I think they dont follow the conditions that I mentioned in #5 post, so they are not considered hypervalent.
Anyways I'll try to search better reasons
11@ Euclid SO4-, S doesnt form dative with O here, its structure was given wrong in arihant so I made a mistake. Sorry.
11@ Euclid,
in SO42-, sulphur forms dative (coordinate bonds) with 2 oxygen atoms and 2 single bonds with other 2 oxygen atoms. So it is not hypervalevt.
11@ Vivek, don't know yaar. [3]
I saw ClO4- structure, it too contains more than octet of electrons.
Let's wait some others to reply
11Answer to your question is the option (B) PO4-3
http://en.wikipedia.org/wiki/Hypervalent_molecule(see for more information)
11Stable compounds of the main group elements in the third row of the periodic table, such as
silicon, phosphorus, and sulfur, that have more than eight valence shell electrons, for
example, PF5 and SF4.
Group 1, 2, and 13–18 compounds which contain a number (N) of formally assignable
electrons of more than eight (octet) in a valence shell directly associated with the central
atom (X) in direct bonding with a number of ligands (L). The designation N-X-L is conveniently
used to describe hypervalent molecules.
In the periodic table, compounds of main group elements in the second row (such as
carbon, nitrogen, and oxygen) have eight valence electrons. As such, the fundamental
shapes of their atoms are linear (such as acetylene, sp orbital), triangular, (such as
ethylene, sp2 orbital), and tetrahedral (such as methane, sp3 orbital). In contrast, main
group elements in the third row of the periodic table (such as silicon, phosphorus, and
sulfur) may contain more than eight electrons in a valence shell. These are called
hypervalent compounds. Fundamental shapes of 10-X-5 molecules (including 10-X-4
molecules bearing a pair of unshared electrons) are trigonal bipyramid (TBP) or square
pyramid (SP), and those of 12-X-6 (including 12-X-5 bearing a pair of unshared electrons)
are octahedral. Hence, there is an apparent similarity in shape between hypervalent
compounds and organotransition metal compounds.
11@ Qwerty you are correct, you just missed one thing,i.e, they are stable also even though
they have more than octet of electrons.
23may be those with more than octet of electrons ?? ( tukka laga raha hoon :P )