Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 30

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Question 1
1 / -0

Amongst the following elements present in an organic compound, the one which has no direct test for detection is :

A
$$Cl$$

B
$$N$$

C
$$S$$

D
$$O$$

Solution

There is no test that can directly indicate the presence of oxygen in an organic compound. The presence of oxygen is indicated indirectly by the presence of groups containing oxygen.
Question 2
1 / -0

Carbon dioxide formed after reaction with cupric oxide is tested by :

A
caustic soda

B
quick lime

C
lime water

D
baking soda

Solution

The given organic compound is mixed with dry copper oxide ($$CuO$$) and heated in a hard glass tube. The products of the reaction are passed over (white) anhydrous copper sulphate and then bubbled through lime water. If copper sulphate turns blue due to the formation of $$CuS{ O }_{ 4 }.5{ H }_{ 2 }O$$ (by water vapor) then the compound contains hydrogen. If lime water is turned milky by $$C{ O }_{ 2 }$$, then the compound contains carbon.
Question 3
1 / -0

In Lassaigne's test, the organic compound is fused with a piece of sodium metal in order to:

A
increase the ionisation of the compound

B
decrease the melting point of the compound

C
increase the reactivity of the compound

D
convert the covalent compound into a mixture of ionic compounds

Solution

Lassaigne's test is a general test for the detection of halogens, nitrogen and sulphur in an organic compound. These elements are covalently bonded to the organic compounds. In order to detect them, these have to be converted into their ionic forms. This is done by fusing the organic compound with sodium metal. The ionic compounds formed during the fusion are extracted in aqueous solution and can be detected by simple chemical tests. The extract is called sodium fusion extract or Lassaigne's extract.
Question 4
1 / -0

The _________ present in the compound is oxidised to water which condenses on the cooler parts of the test-tube or in the bulb of delivery tube :

A
Hydrogen

B
Copper

C
Carbon soot

D
None of the above

Solution

The given organic compound is mixed with dry copper oxide ($$CuO$$) and heated in a hard glass tube. The products of the reaction are passed over (white) anhydrous copper sulphate and then bubbled through lime water. If copper sulphate turns blue due to the formation of $$CuS{ O }_{ 4 }.5{ H }_{ 2 }O$$ (by water vapor) then the compound contains hydrogen. If lime water is turned milky by $$C{ O }_{ 2 }$$, then the compound contains carbon.
Question 5
1 / -0

Which of the following elements in an organic compound cannot be detected by Lassaigne's test?

A
Nitrogen

B
Sulphur

C
Chlorine

D
Hydrogen

Solution

Lassaigne's test is the most reliable test for the detection of nitrogen, halogens and sulphur in an organic compound. The compound is heated with sodium metal to convert the elements present in the organic compound into the water-soluble salts of sodium.
Question 6
1 / -0

Water turns anhydrous copper sulphate solution in the carbon-hydrogen detection experiment :

A
brown

B
red

C
blue

D
green

Solution

The given organic compound is mixed with dry copper oxide ($$CuO$$) and heated in a hard glass tube. The products of the reaction are passed over (white) anhydrous copper sulphate and then bubbled through lime water. If copper sulphate turns blue due to the formation of $$CuS{ O }_{ 4 }.5{ H }_{ 2 }O$$ (by water vapor) then the compound contains hydrogen. If lime water is turned milky by $$C{ O }_{ 2 }$$, then the compound contains carbon.
Question 7
1 / -0

Water formed is tested by :

A
Copper nitrate test

B
Anhydrous copper sulphate test

C
Aqueous copper sulphate test

D
Copper

Solution

The given organic compound is mixed with dry copper oxide ($$CuO$$) and heated in a hard glass tube. The products of the reaction are passed over (white) anhydrous copper sulphate and then bubbled through lime water. If copper sulphate turns blue due to the formation of $$CuS{ O }_{ 4 }.5{ H }_{ 2 }O$$ (by water vapor) then the compound contains hydrogen. If lime water is turned milky by $$C{ O }_{ 2 }$$, then the compound contains carbon.
Question 8
1 / -0

Which one of the following processes will produce hard water ?

A
Saturation of water with $$CaCO_3$$

B
Saturation of water with $$MgCO_3$$

C
Saturation of water with $$MgSO_4$$

D
none of the above

Solution
Question 9
1 / -0

The presence of carbon in an organic compound is detected by heating it with :

A
sodium metal to convert it to $$NaCN$$

B
$$CaO$$ to convert it into $$CO$$ which burns with a blue flame

C
$$CuO$$ to convert it into $$CO_2$$ which turns lime water milky

D
$$Cu$$ wire to give a bluish-green flame

Solution

The given organic compound is mixed with dry copper oxide ($$CuO$$) and heated in a hard glass tube. The products of the reaction are passed over (white) anhydrous copper sulphate and then bubbled through lime water. If copper sulphate turns blue due to the formation of $$CuS{ O }_{ 4 }.5{ H }_{ 2 }O$$ (by water vapor) then the compound contains hydrogen. If lime water is turned milky by $$C{ O }_{ 2 }$$, then the compound contains carbon.
Question 10
1 / -0

The I.U.P.A.C. name of acetylene is :

A
Propane

B
Propyne

C
Ethene

D
Ethyne

Solution

In acteylene 2 carbon atoms are present hence general name is ethane and triple bond is present so the suffix to be added is 'yne'. Hence the I.U.P.A.C name is ethyne.
$$H-C\equiv C-H$$

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Organic Chemistry Some Basic Principles and Techniques Test - 30

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Organic Chemistry Some Basic Principles and Techniques Test - 30

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SHARING IS CARING

Question 1

$$Cl$$

$$N$$

$$S$$

$$O$$

Solution

Question 2

caustic soda

quick lime

lime water

baking soda

Solution

Question 3

increase the ionisation of the compound

decrease the melting point of the compound

increase the reactivity of the compound

convert the covalent compound into a mixture of ionic compounds

Solution

Question 4

Hydrogen

Copper

Carbon soot

None of the above

Solution

Question 5

Nitrogen

Sulphur

Chlorine

Hydrogen

Solution

Question 6

brown

red

blue

green

Solution

Question 7

Copper nitrate test

Anhydrous copper sulphate test

Aqueous copper sulphate test

Copper

Solution

Question 8

Saturation of water with $$CaCO_3$$

Saturation of water with $$MgCO_3$$

Saturation of water with $$MgSO_4$$

none of the above

Solution

Question 9

sodium metal to convert it to $$NaCN$$

$$CaO$$ to convert it into $$CO$$ which burns with a blue flame

$$CuO$$ to convert it into $$CO_2$$ which turns lime water milky

$$Cu$$ wire to give a bluish-green flame

Solution

Question 10

Propane

Propyne

Ethene

Ethyne

Solution

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