Q: Identify the reactions that will not provide [NO]+ as the major product
a) NOCl + AgNO3 →
b) NOCl + liq N2O4 →
c)NOCl + liq BrF3 →
d) NaNO3 + liq N2O4 →
1) a & d 2) a & b
3) b & c 4) a only
Ans. (1)
Hints:
Reaction (a) is neutralization reaction
NOCl + AgNO3 → AgCl + N2O4
In reaction (b) NOCl behaves as a acid in liq N2O4 and ionizes to give [NO]+ as the major product
NOCl + liq N2O4 → NO+ + Cl-
In reaction (c) liquid BrF3 abstract Cl from NOCl to give as the major product
NOCl + liq BrF3 → NO+ + BrF3Cl
In reaction (d) NaNO3 behaves as a base in liquid N2O4 and ionizes to give sodium ion and nitrate ion
NaNO3 + liq N2O4 → Na+ + NO3-
Q: Among the following group of anions, the one which corresponds to the appropriate group of pseudo halide anions is
a) CNO-,
NCO-, SeCN-, N3-
b) HSO4-,
AsF6-, SCN-, NO3-
c) H2PO4-,
HSO4-, ClO4-, PF6-
d)
ClO4-, CN-, H2PO4-,
BF4-
Ans. (a)
Hints:
There are many anions that exhibit similar properties like halide ions. They are termed as pseudo halide and their dimers are called pseudo halogens. Therefore pseudo halides are CNO-, CN-, NCO-, SeCN-, N3-
Q: Which is the number of 13C-NMR resonance exhibited by C70 and nature (Magnetism) of rhombohedral polymer of C60 respectively
a) 1 & Ferromagnetic b)
1 & Antiferromagnetic
c) 5 & Ferromagnetic d) 5 & Antiferromagnetic
Ans. (c)
Hints:
The C70 is a biproduct obtained during the synthesis of C60. C70 possesses five different types of carbon atoms in its structure, where as C60 has only one type of carbon. Thus C60 gives five 13C-NMR resonance, where as C60 gives only one 13C-NMR resonance. The nature of rhombohedral polymer of C60 is Ferromagnetic.
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