question_answer

Which of the following pairs are correctly matched?

I. Teflon:    \[C{{F}_{2}}=C{{F}_{2}}\]

II. Natural rubber: \[C{{H}_{2}}=\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}\]

III. Nylon. 66: \[N{{H}_{2}}-{{(C{{H}_{2}})}_{5}}-COOH\]

IV. Perspex   : \[C{{H}_{2}}=CC\,{{l}_{2}}\]

Select the correct answer using the codes given below:

A) I and II                         

B) II and III

C) III and IV                      

D) I and IV