The correct order of `1^(st)` ionisation enthalpy is :

Options

A. `Ti lt Mn lt Ni lt Zn`
B. `Zn lt Ni lt Mn lt Ti`
C. `Ti lt Mn lt Zn lt Ni`
D. `Mn lt Ti lt Zn lt Ni`

Answer

A

Explanation

Increasing order of the first ionization enthalpies is :
`Ti lt Mn lt Ni lt Zn`
`{:("Element", Ti, Mn, Ni, Zn),("Ionisation ethalpy", 656,717,736,906):}`
(KJ/ mole)