For the molecular formulas given below, give the number of elements of unsaturation. Select the appropriate structure as an example for each.
(i) C₆H₇NO₂
(ii) C₇H₅BrIN

• A. (i) 5 elements of unsaturation(ii) 6 elements of unsaturation
• B. (i) 5 elements of unsaturation(ii) 6 elements of unsaturation
• C. (i) 4 elements of unsaturation(ii) 5 elements of unsaturation 
• D. (i) 4 elements of unsaturation(ii) 5 elements of unsaturation 

Answer: (D)