Question

The reaction which takes place in the presence of sunlight is _____.
a.) Halogenation
b.) Photosynthesis
c.) Hydrogenation
d.) None of these

Answer 1

Hint: The reaction which takes place in the presence of sunlight is the reaction which is used by plants and other organisms to convert light energy into electrical energy. In this reaction light energy is captured and it is used to convert water and carbon dioxide into oxygen and other organic compounds which are rich in energy.

Complete step by step answer:
In the presence of sunlight green plants prepare their food by taking in $C{{O}_{2}}$ and ${{H}_{2}}O$from air and soil respectively with the help of chloroplasts present in the green leaves of plants. This reaction is known as photosynthesis.

The reaction involved is mentioned below:
\[6C{{O}_{2}}+6{{H}_{2}}O\xrightarrow[chlorophyll]{sunlight}{{C}_{6}}{{H}_{6}}{{O}_{12}}+6{{O}_{2}}\]
Photosynthesis is performed differently by different species but some of the part is common, the carbon dioxide enters in the leaf of the plant through stomata by the process of diffusion. Photosynthesis occurs in the chloroplast. Leaves contain a green pigment known as chlorophyll, it absorbs the light energy from the sun. Oxygen is the waste product produced in the process of photosynthesis.
Halogenation: It is a chemical reaction in organic chemistry in which there is an addition of one or more halogen to a compound or substance.
Hydrogenation: It is a chemical reaction in which a compound reacts with molecular hydrogen which takes place usually in the presence of a catalyst.
So, the correct answer is “Option B”.

Note: Photosynthesis is a two-step process the first step is the light dependent process and the second step is light independent step. The light dependent reaction takes place in the thylakoid membrane and the light independent reaction takes place in stroma.