Low spin complex of `d^6`-cation in an octahedral field will have the following energy:

Options

A. `-2/5Delta_(0)+2P`
B. `-2/5Delta_(0)+P`
C. `-12/5Delta_(0)+P`
D. `-12/5Delta_(0)+3P`

Answer

D

Explanation

Electroing confeguration of `d^(6)`-cation in low spin = `t_(2g)^(6) eg^(0)`
CFSE = `(-0.4x+0.6y)Delta_(0)`
=`(-2/5x+3/5y)Delta_(0)`
x= number of electron in `t_(2g)`= 6
y = number of electron in `e_(g)` = 0
CFSE = `(-2/5xx6+0)Delta_(0) = -12/5Delta_(0)`
No. of electron pairs = 3
Pairing energy = 3P
`:.` Energy of low spin `d^(6)` cation = `-12/5Delta_(0) + 3P`.