Answer:            <span>
A hexagon with nothing drawn inside it does not represent Benzene.
Explanation:Below attached picture contains structures mentioned in given option.
Structure of 
Option-A is shown in 
Red Color.
</span>
Structure of 
Option-B is shown in 
Blue Color.
Structure of 
Option-C is shown in 
Green Color.
Structure of 
Option-D is shown in 
Orange Color.
Result:          Except Option-A, all structures represent Benzene. Option-A in fact shows the structure of Cyclohexane.
 
        
                    
             
        
        
        
Sugar. (We need a design tech section)
        
             
        
        
        
1 mole of N2 produces 2 moles of NH3
OR...
14 x 2 grams of N2 produces 2(14 +3) grams of NH3
1 gram of N2 produces 34/28 grams of NH3
therefore, 56 grams produce (34/28 )x 56 =68 grams of NH3 
the answer thus would be 68 grams of NH3
        
             
        
        
        
Answer:
radius = 156 pm
Explanation:
The relation between radius and edge length of unit cell of BCC is
r=a /4
/4
Given
a = 360 pm
Therefore
r = r = radius = 360 /4= 155.88 pm
/4= 155.88 pm
Or
156 pm