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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science) 
		 
			 
			 
			 
			 
			 
			 
			 
			 
			 
 30 points
 30 points 
 
 
 
             
            

 
                
Abhijeet Gaurav Best Answer
Answer is (D). Because the dipeptide in option D doesn't have an R group. So it Will have least rotational barrier.