Q26 of 30 Page 1

The formulae of four organic compounds are given below:


(i) Which one of these compounds A, B, C or D is a saturated hydrocarbon?


(ii) Identify the organic acid and give its structural formula.


(iii) Which ofthe above compounds when heated at 443K in the presence of concentrated forms ethene as the major product? What is the role played byconcentrated in this reaction? Also write the chemical equationinvolved.


(iv) Give a chemical equation when B and C react with each other


in presence of concentrated. Name the major product formed andmention one of its important use.


(i) Saturated hydrocarbons are those which has only single bond within the carbon atoms.

Therefore, Compound D which is ethane is a saturated hydrocarbon


(ii) Compound B which is ethanoic acid is an organic acid as it has carboxylic acid group .


The structural formula is:


93f1f802-c245-4d76-a835-7a60794cb3da6356076704264900273.png


(iii) Compound C which is ethanol. On heating, it gives ethene as the major product. The reaction is shown below as:


Capture.PNG


H2SO4 acts as a dehydrating agent which eliminates water from ethanol. It acts as catalyst.


(iv) On reacting compound B and C, ethanoic acid and ethanol, it gives ester, ethyl ethanoate. They are sweet smelling compounds and used as artificial flavouring agents.



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24

In the figure given below, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum XY on the screen.


(i) Name the phenomenon.


(ii) State the colors seen at X and Y.


(iii)Why do different colors of white light bend at different angles through a prism?


OR


(i) What is visible spectrum?


(ii) Why is red used as the stopping light at traffic signals?


(iii)Two triangular glass prisms are kept together connected through their rectangular side. A light beam is passed through one side of the combination. Will there be any dispersion? Justify your answer.


 25

(I)Metal X is found in nature as its sulphide XS. It is usedin the galvanisation of iron articles. Identify the metal X.How will you convert this sulphide ore into the metal?Explain with equations.

OR


(II)State the reason for the following:


(i) Aluminium oxide is called anamphoteric oxide.


(ii) An iron strip dipped in a blue copper sulphatesolution turns the blue solution pale green.


(iii) Hydrogen gas is not evolvedwhen most metals react with nitric acid.


(iv) Calcium does not occur in freestate in nature.


(v) Sodium or potassium metals are kept immersed underkerosene.


 27


(i) Identify any two parts from the above diagram which carry oxygenated and deoxygenated blood.


(ii) Explain the process of double circulation with the help of a flow chart


 28

(i) Describe the various steps involved in the process of binary fission with the help of a diagram.

(ii) Why do multicellular organisms use complex way of reproduction?


OR


(i) Describe the role of prostate gland, seminal vesicle and testes in the human male reproductive system.


(ii) How is the surgical removal of unwanted pregnancies misused?


(iii) Explain the role of oral contraceptive pills in preventing conception.