What is the monomer of natural rubber?

What is the molecular formula of ethyl acetate?

Which of the following are the heteroatoms present in $CH_{3}-CH_{2}-O-CH_{2}-CH_{2}Cl$?
$(i)$ Oxygen
$(ii)$ Carbon
$(iii)$ Hydrogen
$(iv)$ Chlorine

Which of the following tests is used for the detection of glucose?

How would you name the following compounds?
$(i)$ $CH_{3}-CH_{2}-CH=CH_{2}$
$(ii)$ $CH_{3}-CH_{2}-CH_{2}-C(CH_{3})_{2}-CH_{3}$
$(iii)$ $CH_{3}-CH_{2}-CHO$
$(iv)$ $CH_{3}-CH(OH)-CH_{3}$

Carbon has four electrons in its valence shell. How does carbon attain stable electronic configuration?