III B.Sc Chemistry - Quiz II (CC2061)

The transition with high energy is ________

• n → π^*

• n → σ^*  

• σ → σ^*

• π → π^*

The transition    n → σ^*  is observed in ________

• alcohols   

• alkanes  

• alkenes       

• dienes

Pick out the chromophore from the following

• -NH₂  

• -OH  

• -Cl  

• -C=O

Shift of an absorption maximum to _____ wavelength is called hypsochromic shift.

• Longer      

• shorter        

• no change 

•  none of these

The region of    UV -Vis  is    ________

• 200-800 cm    

• 200-800 nm           

• 400-700nm             

• 300-700nm

λ_max  of ethylene is ______nm

• 165          

• 125          

•    185            

•  200

The region from 1450-500 cm^-1 in IR spectrum is known as  ^{____________.}

• chromophoric region

• auxochromic region 

• finger print region 

• -OH bending region

Shielding of protons causes ______ shift

• Hypsochromic 

• Bathochromic 

• upfield 

• downfield

The IR absorption band of intramolecular H-bonging is independent of concentration.

• True

• False

How many NMR signals are obtained for ethanol?

• 3           

• 2

• 1

• 4