Which class of carbon compounds is responsible for the depletion of ozone layer at the higher level of the atmosphere?

Name the functional group present in each of the following organic compounds:1

(i) CH₃COCH₃ (ii) C₂H₅COOH

Which phenomenon is responsible for making the path of light visible?

List four properties of the image formed by a concave mirror when object is placed between focus and pole of the mirror.

Define the term puberty. List two changes observed in girls at the time of puberty.