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Octet Rule

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Question

From the following organic compounds given below, choose one compound in each case which relates to the description [i] to [iv]: [Ethyne, ethanol, acetic acid, ethene, methane].

(ii) An organic compound whose functional group is carboxyl.

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Solution

An organic compound whose functional group is carboxyl is acetic acid $(C H_{3} C O O H)$ .

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Q. Select the correct answer from the choices a, b, c and d which are given.
Write only the letter corresponding to the correct answer.
(i) An organic compound undergoes addition reactions and gives a red colour precipitate with ammoniacal cuprous chloride. Therefore, the organic compound could be:
(a) Ethane
(b) Ethene
(c) Ethyne
(d) Ethanol

(ii) The organic compound mixed with ethanol to make it spurious is:
(a) Methanol
(b) Methanoic acid
(c) Methanal
(d) Ethanoic acid

Q. (a) Which functional group do you think can be present in an organic compound having the molecular formula C₅H₁₀O₂? Write the formula of the organic compound.
(b) Give one example each of the compounds having the following functional groups:
(i) Aldehyde group
(ii) Alcohol group
(iii) Carboxylic acid group
(iv) Halo group
(c) Give one example each of the compounds having the following functional groups:
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(ii) Alkyne group

Q. The list of some organic compounds is given below:
ethanol, ethane, methane, ethyne, and ethene
From the above list, name a compound:
(i) formed by the dehydration of ethanol by concentrated sulphuric acid.
(ii) which forms methanoic acid on oxidation in the presence of copper at 200°C.
(iii) which has vapour density 14 and turns acidic potassium permanganate colourless.
(iv) which forms chloroform on halogenation in the presence of sunlight.
(v) which decolourises bromine solution in carbon tetrachloride.

Q. (a) Draw the structural formula of a compound with two carbon atoms in each of the following cases:
(i) An alkane with a carbon to carbon single bond.
(ii) An alcohol containing two carbon atoms.
(iii) An unsaturated hydrocarbon with a carbon to carbon triple bond.

(b) Ethane, Ethene, Ethanoic acid, Ethyne, Ethanol
From the compounds given above, name:
(i) The compound with —OH as a part of its structure.
(ii) The compound with —COOH as a part of its structure.
(iii) Homologue of Homologous series with general formula C_nH_2n.

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i) An unsaturated hydrocarbon used for welding purposes.

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