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The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given comple…

Q1

The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given complexes is

[JEE Advanced 2025, Paper-1]

a

\({\left[\mathrm{Co}{\left(CN\right)}_{6}\right]}^{3-}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}(\mathrm{Cl})\right]}^{2+}\)

b

\({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}(\mathrm{Cl})\right]}^{2+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}<{\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-}\)

c

\({\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}(\mathrm{Cl})\right]}^{2+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\)

d

\({\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}<{\left[\mathrm{Co}(\mathrm{CN}{)}_{6}\right]}^{3-}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}(\mathrm{Cl})\right]}^{2+}<{\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{5}\left({\mathrm{H}}_{2}\mathrm{O}\right)\right]}^{3+}\)

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