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प्रश्न
Give a test that can be used to differentiate chemically between butter and cooking oil.
Give a test that can be used to differentiate between saturated and unsaturated hydrocarbons.
उत्तर
A bromine water test can be used to chemically differentiate between butter (Saturated) and cooking oil (Unsaturated).
Take two test tubes, one with a small amount of butter in it and the other with some cooking oil. Add bromine water to both the test tubes.
Observation:
- Cooking oil decolourises bromine water indicating that it is an unsaturated compound.
- Butter does not decolourise bromine water indicating that it is a saturated compound.
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संबंधित प्रश्न
Give any two differences between alkanes and alkenes.
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i. Write the name of element ‘A’ and its allotropes.
ii. State whether ‘B’ is a good conductor or non-conductor of electricity?
Draw the electron dot structures for propanone.
Draw the electron dot structures for F2.
Why are certain compounds called hydrocarbons? Write the general formula for homologous series of alkanes, alkenes and alkynes and also draw the structure of the first member of each series. Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur.
A compound 'X' on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound 'Y'. 'X' also reacts with sodium metal to evolve a colourless gas 'Z'. Identify 'X', 'Y' and 'Z'. Write the equation of the chemical reaction of formation of 'Y' and also write the role of sulphuric acid in the reaction.
Write the electron-dot structures for ethene.
Which of the following will give addition reaction and why?
C4H10, C2H6, C2H4, CH4, C3H8, C3H4
Name the reaction which is usually used in the conversion of vegetables oils to fats. Explain the reaction involved in detail. Write a chemical equation to illustrate your answer.
Which of the following hydrocarbons can decolourise bromine water and which cannot? Why?
C6H12, C6H14, C6H10
Differentiate between alkanes and alkenes. Name and draw the structure of one member of each.
Name a cyclic unsaturated carbon compound.
How many double bonds are there in a saturated hydrocarbon?
In which of the following compounds, — OH is the functional group?
Structural formula of ethyne is
The name of the compound CH3 — CH2 — CHO is
- What are hydrocarbons? Give examples.
- Give the structural differences between saturated and unsaturated hydrocarbons with two examples each.
- What is a functional group? Give examples of four different functional groups.
Draw the electron dot structure for ethyne.
- Write the name and draw the structure of a saturated hydrocarbon with four carbon atoms.
- Write the number of single covalent bonds present in this compound.
