Which of the following is wrong statement?
Ni(CO)4 has oxidation number +4 for Ni
Ni(CO)4 has zero oxidation number for Ni
Ni is metal
CO is gas
Which carbocation is most stable ?
CH3CH
C
C6H5C
CH3CH2C
C.
C6H5C
A phenyl group, in which there is a flow of electron due to resonance of the benzene ring, generally causes -I effect, but can act as both electron donating as well as electron withdrawing groups, depending upon the nature of group with which it is attached. In C6H5CH phenyl group is attached to electron deficient group, hence it will donate electron due to resonance in benzene ring and thus stabilise the cation.
H2C2O4 + KMnO4 in acidic medium reacts to have change in oxidation number of Mn from
7 to 5
2 to 7
5 to 7
7 to 2
Frenkel and Schottky defects are
nucleus defects
non-crystal defects
crystal defects
nuclear defects