Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 29

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Question 1
1 / -0

Homologous series is____________.

A
a series of compounds in which the same functional group substitutes for hydrogen in a carbon chain.

B
a series of compounds in which different functional group substitutes for hydrogen in a carbon chain.

C
a series of compounds with same molecular formula and different structural formulae.

D
a series of compounds with same molecular formula but different functional groups.

Solution

Homologous series is a series of compounds in which the same functional group substitutes for hydrogen in a carbon chain. The chemical properties of the compounds are very similar.

Example of a homologous series: $$CH_3OH, C_2H_5OH, C_3H_7OH, C_4H_9OH$$
Question 2
1 / -0

In the given potential energy diagram, the point $$X$$ represents:

A
a transition state

B
a reaction intermediate

C
a resonance hybrid

D
a reactant

Solution

In the given potential energy diagram, the point X represents the transition state. It is the maximum energy state and below which reaction will not occur.
Question 3
1 / -0

In the detection test of carbon and hydrogen with cupric oxide, carbon is oxidized to :

A
carbon monoxide

B
carbon dioxide

C
carbonic acid

D
copper sulphate

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.So, the carbon is oxidized to $$C{ O }_{ 2 }$$.
Question 4
1 / -0

In the detection test of carbon and hydrogen with cupric oxide, hydrogen is oxidized to __________.

A
water

B
methane

C
hydride

D
lime water

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

$$2H+CuO \rightarrow X+Y$$

The compound $$X$$ and $$Y$$ are:

A
$$H_2O, Cu$$

B
$$H_2, CuO$$

C
both $$A$$ and $$B$$

D
none of the above

Solution

Compounds X and Y can be identified from the reaction below:
$$2H+CuO\longrightarrow { H }_{ 2 }O+Cu$$
Question 6
1 / -0

The given diagram is an apparatus for carbon detection. Fill in the blank of the labelled diagram.

A
Cupric oxide

B
Anhydrous copper sulphate

C
Copper precipitate

D
Calcium carbonate

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

The compound of the molecular formula, $$C_6H_{14}$$ has two tertiary carbons. Its IUPAC name is:

A
n-hexane

B
$$2-$$methylpentane

C
$$2,3-$$dimethylbutane

D
$$2,2-$$dimethylpentane

Solution

Molecular formula of the compound is $$C_{6}H_{14}$$. The compound has 2 tertiary carbon. Then the probable structure of the compound will be $$CH_{3}-CH(Me)-CH(Me)-CH_{3}$$. Name of this compound is 2,3-dimethylbutane. So the correct option is C
Question 8
1 / -0

Carbon and hydrogen are detected by heating the organic compound with ________.

A
magnesium oxide

B
cupric oxide

C
zinc oxide

D
sulphur dioxide

Solution

The detection of various elements present in an organic compound is called qualitative analysis. Carbon and hydrogen are present in almost all the organic compounds. Carbon and hydrogen are detected by heating the organic compound with cupric oxide ($$CuO$$) strongly, where carbon is oxidized to carbon dioxide and hydrogen to water. Carbon dioxide is tested by lime water test, whereas water is tested by anhydrous copper sulphate test.
Question 9
1 / -0

$$C+2CuO \rightarrow X+Y$$

The compound $$X$$ and $$Y$$ are :

A
$$CO_2, \ 2Cu$$

B
$$CO, \ Cu_2O$$

C
both $$A$$ and $$B$$

D
none of the above

Solution

The reaction takes place as follows:
$$C+2CuO\longrightarrow C{ O }_{ 2 }+2Cu$$
Question 10
1 / -0

Carbon present in the compounds is oxidised to carbon dioxide which:

A
turns blue litmus red

B
turns lime water milky

C
turns solution to green

D
has no effect on solution

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 vapour) then the compound contains hydrogen. If lime water is turned milky by $$C{ O }_{ 2 }$$, then the compound contains carbon.

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Organic Chemistry Some Basic Principles and Techniques Test - 29

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Organic Chemistry Some Basic Principles and Techniques Test - 29

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Question 1

a series of compounds in which the same functional group substitutes for hydrogen in a carbon chain.

a series of compounds in which different functional group substitutes for hydrogen in a carbon chain.

a series of compounds with same molecular formula and different structural formulae.

a series of compounds with same molecular formula but different functional groups.

Solution

Question 2

a transition state

a reaction intermediate

a resonance hybrid

a reactant

Solution

Question 3

carbon monoxide

carbon dioxide

carbonic acid

copper sulphate

Solution

Question 4

water

methane

hydride

lime water

Solution

Question 5

$$H_2O, Cu$$

$$H_2, CuO$$

both $$A$$ and $$B$$

none of the above

Solution

Question 6

Cupric oxide

Anhydrous copper sulphate

Copper precipitate

Calcium carbonate

Solution

Question 7

n-hexane

$$2-$$methylpentane

$$2,3-$$dimethylbutane

$$2,2-$$dimethylpentane

Solution

Question 8

magnesium oxide

cupric oxide

zinc oxide

sulphur dioxide

Solution

Question 9

$$CO_2, \ 2Cu$$

$$CO, \ Cu_2O$$

both $$A$$ and $$B$$

none of the above

Solution

Question 10

turns blue litmus red

turns lime water milky

turns solution to green

has no effect on solution

Solution

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