A hydrocarbon with the formula C_xH_y undergoes complete combustion as shown in the following equation :

2C_xH_y + 9O₂ → 6CO₂ + 6H₂O.

(a) What are the values of ‘x’ and ‘y’?

(b) Give the chemical (IUPAC) name of the hydrocarbon.

(c) Draw its electron dot structure.

(d) Name the alcohol which on heating with conc. H₂SO₄ will produce the above hydrocarbon C_xH_y.

(e) Write a balanced chemical equation for the reaction of C_xH_y with hydrogen gas in presence of Nickel.

The electronic structures of atoms P and Q are shown below :

Based on the information given above, answer the following questions:

(a) If P and Q combine to form a compound, what type of bond is formed between them?

(b) Give the chemical formula of the compound formed.

(c) The compound so formed is dissolved in water. Is the resultant solution acidic or basic in nature? Justify your answer.

(d) Write the chemical equation for the reaction between ‘Q’ and ethanol.

(e) What will be the formula of the compound formed when ‘P’ undergoes bonding with carbon?

Oxygen can combine with both metals and non-metals. It combines with Calcium to form CaO and with carbon to form CO₂.

(a) What type of bond is formed between carbon and oxygen?

(b) Identify the type of bond formed between Calcium and oxygen.

(c) Which of the above compounds will be a good conductor of electricity in molten state and why?

(d) Comment on the physical state (solid, liquid or gas) of CaO and CO₂.

(e) What is the valency of carbon in CO₂?