UV VISIBLE SPECTROSCOPY
Quiz by Jone Kirubavathy PSGRKCW (Che)
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- Q1
The effect of hydrogen bonding on λmax is------------------
Bathochromic shift
Hypsochromic shift
Hypochromic shift
Hyperchromic shift
60s - Q2
Aqueous solution of mesityl oxide shows two absorption peaks at λmax 305 and 243 nm in its UV spectrum. Identify the type of transition
π-π*, n-σ*
π-π*, n- π*
σ- σ*, n- π*
n- π*,π-π*,
60s - Q3
The λmax values of the following compounds are 242 nm, 254 nm and 259 nm in ethanol. Which is which?
A- 259 nm B- 254 nm C-242 nm
A-259 nm B- 242 nm C-254 nm
A-249 nm B- 242 nm C-259 nm
A-242 nm B- 259 nm C-254 nm
60s - Q4
The position of UV absorption maxima of aniline in aqueous solution are different from those of benzene but those of aniline in an acidic aqueous solution at pH=1 are almost identical with those of benzene. Pick out the reasons
All the above
Both the bands K and B bands are shifted to longer wavelength in aqueous medium
In acidic solution, protonation occurs at the lone pair of N atom.
lone pair of electrons on N atom in aniline spread into benzene ring due to resonance
60s - Q5
In UV Visible spectrum of α, β Unsaturated carbonyl compounds, with increasing polarity
both transitions undergo hypsochromic
both transitions undergo bathochromic
n-π* transitions show bathochromic and π-π* transitions show hypsochromic shifts
n-π* transitions show hypsochromic and π-π* transitions show bathochromic shifts
60s - Q6
Calculate absorption maxima
278 nm
252 nm
302 nm
282 nm
60s - Q7
For electronic transitions in organic molecules the expected energy ordering of the transition
n- π*< π-π*< n-σ*< σ- σ*
π-π*< <n- π*< n-σ*< σ- σ*
n-σ*< σ- σ*< n- π*< π-π*
π-π*<n-σ*<σ- σ*<n- π*
60s - Q8
Identify the correct statement regarding auxochrome
Auxochromes are substances which absorb UV and visible light radiations and impart colour to the compound
hydroxyl group is an eg for auxochrome
Groups that increase the absorption value
Both B and C
30s - Q9
How many exocyclic double bonds in this organic compound?
3
0
2
1
30s - Q10
Calculate absorption maxima
268 nm
218 nm
281 nm
286 nm
60s
