Spectral Shifts

Which of the following is not an auxochrome group?

• –OH

• –SH

• –OR

• –O2

Which of the following shift leads to the decreased intensity of absorption?

• Hypochromic

• Hyperchromic

• Hypsochromic

• Bathochromic

Increase in the intensity of absorp in UV-Visible spectrum is called

• Hypsochromic

• Bathochromic

• Hyperchromic

• Hypochromic

An absorption towards longer wavelength is called

• Bathochromic shift

• Hypsochromic shift

• Hyperchromic shift

• Hypochromic shift

An absorption towards shorter wavelength is called as

• Bathochromic shift

• Hypsochromic shift

• Hyperchromic shift

• Hypochromic shift

Methane molecule show ------- electronic transition

• σ→σ*

• π→π*

• n→π*

• n→σ*

UV spectroscopy provides information about presence of ……..

• Multiple bond

• Extent of conjugation

• Aromatic rings

• All of the above

Which transition requires higher energy?

• sigma to sigma *

• pi to pi*

• n to sigma*

• n to pi*

Which among the following impart colour to the organic compound?

• Auxochrome

• Chromophore

• Chromone

• Auxochromone

Which of the following defines auxochrome?

• A functional group that can change lambda max when it attached to a chromophore

• An electron-deficient group attached to a benzene ring, which reduced the quantum yield

• An electrophilic group attached to a chromophore