Chlorine has two isotopes ${ }^{35} \mathrm{Cl}$ and ${ }^{37} \mathrm{Cl}$ with average atomic mass of 35.5 . What is the ratio of their relative abundance respectively?

Which among the following is NOT a true statement regarding enantiomers?

Which from following polymers is believed to leach human carcinogen in to food when used as household plastic?

Which from following molecules has trigonal planar geometry?