Organic Chemistry

Which one of the following transition require lowest energy

           

• n, π^*  

• π , π^*

• σ,  π^*

• n, σ^*

The basic value of a cis diene is ------ nm.     

• 215

• 255

• 246

• 250

Which one of the following molecule exhibit IR spectra       

• H₂

• CO

• N₂

• Cl₂

The characteristic frequency of carbonyl group in ketone is

•   1710cm^-1

• 700 cm^-1

• 3200 cm^-1   

• 1100 cm^-1

In NMR, the chemical shift position of TMS in δ scale is

• 0

• 10

• -10

• 1

Which one of the following is a nonreducing sugar

• Glucose   

• sucrose  

• maltose 

• lactose

Monosaccharides undergo reversible isomerisation in the presence of dilute alkali. This reaction is            

• Mutarotation 

• Lobry de Bruyn Van Ekenstein rearrangement           

• epimerisation    

• None of these

8. The reagent which can be used to distinguish between starch and cellulose is

• Tollen’s reagent  

• Acetic anhydride

• Iodine solution

• Fehling’s reagent

Which one of the following disaccharides on hydrolysis gives only glucose units

• Maltose 

• Sucrose   

• Lactose

• None of these

. Which product derived form of cellulose is nick named as new skin

     

• Cellulose nitrate  

• Pyroxyline  

• Cellulose xanthate

•   d.  Cellulose acetate