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a
CN2
b
SCN2
c
OCN2
d
All the above
answer is D.
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Detailed Solution
Pseudo halogens contain certain univalent electro-negative inorganic radicals which show a resemblance to halogens in terms of their chemical properties. Following is an example.PbI4→PbI2+I2 Pb(CN)4→Pb(CN)2+(CN)2