✓ Board-verified
Science · 2025 · 5 marks
CBSE 2025 · Region 5 · Set 3 · Q34
(A) (a) Define the term "Functional group of a carbon compound". Write the formula of functional group present in (i) propanol and (ii) propanone.…
(a)
Define the term "Functional group of a carbon compound". Write the formula of functional group present in (i) propanol and (ii) propanone.
(b)
Name the process of conversion of (i) ethanol to ethene and
(ii)
ethanol to ethanoic acid. Write the reaction equation stating the conditions required for each of the reactions to occur.
(a)
Name two cyclic hydrocarbons and draw the structure of any one.
(b)
Explain the process of micelle formation on adding soap in water.
Marking-scheme solution
(a)
Functional group: The element replacing hydrogen in a carbon compound is called heteroatom. These heteroatoms confer special properties to the compound are known as functional groups.
(i)
Functional group present in propanol - OH/ Alcohol
(ii)
Functional group present in propanone - C - / Ketone
(b)(i)
Dehydration
(ii) Oxidation
(a)
Benzene and Cyclohexane
Benzene Cyclohexane Cyclohexane (b) •Soaps are sodium salts of long chain fatty acids. Two ends of soap molecule have different properties. The ionic end is hydrophilic and interacts with water whereas the hydrocarbon chain is hydrophobic and it interacts with oil/ dirt.
-The hydrocarbon chains are towards the oil droplet while the ionic ends are oriented towards water (i.e. it forces outside). This forms an emulsion in water. The soap micelle thus helps in pulling out the dirt in water and the clothes are washed.
All Carbon and its Compounds questions2025 question paperNCERT solutions: Carbon and its CompoundsPractice Carbon and its Compounds →
More from Carbon and its Compounds
- The number of single and double bonds present in a molecule of benzene (C_6 H_6) respectively, are:2024
- Which one of the following hydrocarbons is different from the others?2024
- Draw two different possible structures of a saturated hydrocarbon having four carbon atoms in its molecule. What are these two structures of the…2022
- Hydronium ions are formed by the reaction between:2023
- The number of electrons in the outermost shell of the atom of a non-metal can be:2023
- (i) Butane had both Carbon - Carbon bonds as well as Carbon - Hydrogen bonds. Draw its structural formula and state the number of (1) C-H bonds and…2023
- The melting and boiling points of carbon compounds are generally low and they are largely non-conductors of electricity. State two conclusions based…2024
- Select the correct option(s) in the following table:2023
CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.