For each molecular formula given below, calculate the number of elements of unsaturation. From the given options, choose the correct structure as an example for each.
(i) C₅H₆Br₂
(ii) C₅H₁₀O
(iii) C₇H₁₀O₂

(i) 2 elements of unsaturation

(ii) 1 element of unsaturation

(iii) 3 elements of unsaturation

(i) 2 elements of unsaturation

(ii) 1 element of unsaturation

(iii) 3 elements of unsaturation

(i) 1 element of unsaturation

(ii) 3 elements of unsaturation

(iii) 2 elements of unsaturation

(i) 1 element of unsaturation

(ii) 3 elements of unsaturation

(iii) 2 elements of unsaturation