Write the molecular formula of an alkene and alkane with twenty carbon atoms.

A compound has molecular formula C₂H₆O. It is usable as fuel. Identify the compound.

The molecular formulae of two members of a homologous series are C₃H₄ and C₆H₁₀. Write the molecular formula of the member with five carbon atoms in a molecule.

Which of the following are carboxylic acids:

C₂H₄O₂, C₂H₄O, C₂H₆O, C₃H₆O₂?

A vegetable oil contains two double bonds in its molecule. How many moles of hydrogen gas are required for complete hydrogenation of 1 mole of oil?

Which alcohol is used in cough syrups and tonics?

Is ethanol harmful for drinking? If yes, why?

What is the effect of drinking methanol?

An organic compound ‘A’ of molecular formula C₂H₄O₂ turns blue litmus red and gives brisk effervescence with NaHCO₃. Identify ‘A’ and give chemical reaction.

Which type of synthetic detergents are biodegradable?

Explain why carbon generally forms compounds by covalent bonds.

Select alkene and alkyne from the following:

C₆H₁₂, C₃H₄, C₂H₄, CH₄, C₄H₈, C₅H₈

What is the IUPAC name of

(i) CH₃ – CH₂ – CH = CH₂

(ii) CH₃CHO?

Write the IUPAC name of

(i) CH₃COCH₂CH₃

Which property of ethanol makes it suitable for preparing medicines such as tincture of iodine, cough syrups and other tonics?

What is the function of conc.H₂SO₄ in the formation of ethene from ethanol?

Why are carboxylic acids called weak acids? Name the alcohol which produces methanoic acid on oxidation.

Complete the following reactions:

(i) CH₃COOH + NaOH →

(ii)

(iii) CH₃OH + O₂

(iv) CH₂ = CH₂ + Br →

(v) CH₃COOC₂H₅ + NaOH →

(vi) CH₂ = CH₂ + H₂O

(i) Why do we add ethanol to petrol in these days?

(ii) Give one use of ethanol in medicines.

(iii) Why is vinegar used in pickles?

(a) Identify the compounds ‘A’, ‘B’ and ‘C’ in the following reactions:

(i) C₂H₅OH + CH₃CH₂COOH ‘A’ + H₂O

(ii) CH₃COOC₂H₅ + NaOH →‘B’ + C₂H₅OH

(iii) CH₃COONa + NaOH(CaO) ‘C’ + Na₂CO₃

(b) A cyclic compound ‘X’ has molecular formula C₆H₆. It is unsaturated and burns with a sooty flame. Identify ‘X’ and write its structural formula. Will it decolourise bromine water or not and why?

(a) A compound ‘X’ is C₂H₄. Draw its electron dot structure. Will it dissolve in water or not? Will it conduct electricity in aqueous solution? Will it have high melting or low melting point?

(b) A compound ‘X’ has molecular formula C₄H₁₀. It undergoes substitution reaction readily than addition reaction. It burns with blue flame. It is present in LPG. Identify ‘X’ and give the balanced equation for its combustion and substitution reaction with Cl₂ in presence of sunlight.

(c) Why are vegetable oils healthy as compared to vegetable ghee? How are vegetable oils converted into vegetable ghee? Name the process.

A prestigious school of Delhi has large canteen which sells burgers, patties, cold drink, Pizzas, Samosas, chips, etc. Most of the children enjoy eating these junk food. School authorities have asked them to sell fresh fruit juices, sprouts, boiled corns, fresh fruits, nimbupani etc. but sale of these items is very less. Some children take sips from same cold drink bottle and bites of same burger.

(a) Which preservative is present in cold drinks?

(b) Which acid is present in vinegar added to vegetable chow mien?

(c) What will you do to make people aware that junk food is harmful for health? Give two suggestions.

(d) What is wrong/right in sipping cold drinks from same bottle or biting same burger by many students? Give one reason.

(e) Do you think junk food and cold drinks should be banned in school canteen as per the directive of Hon’ble High Court’s order? Give two reasons in support of your answer.

Government of India is imposing ban on the use of polythene bags for shopping. List four advantages of using cloth or jute bags over polythene bags.