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Carbon & its Compounds - 2


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20 Questions MCQ Test Science & Technology for UPSC CSE | Carbon & its Compounds - 2

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Carbon & its Compounds - 2 - Question 1

Which of the following represents the saponification reaction ?

Detailed Solution for Carbon & its Compounds - 2 - Question 1

Hydrolysis of an ester with alkali is called saponification reaction.

Carbon & its Compounds - 2 - Question 2

Ethanol, on heating at 443 K with conc H2S04 gives

Detailed Solution for Carbon & its Compounds - 2 - Question 2

When ethanol is heated with concentrated sulphuric acid at 443 K, dehydration takes place and ethene is formed. In this reaction concentrated sulphuric acid acts as a dehydrating agent.
CH3-CH2-OH → (H2SO4 + heat) → CH2=CH2 + H2O

Carbon & its Compounds - 2 - Question 3

Which among the following are unsaturated hydrocarbons ?
(i) H3C -CH2-CH2-CH
(ii) H3C -C = C-CH
(iii) 
(iv) 

Detailed Solution for Carbon & its Compounds - 2 - Question 3

Compounds of carbon and hydrogen containing double or triple bonds in the molecule are called unsaturated hydrocarbons.

Carbon & its Compounds - 2 - Question 4

The blindness and death is caused by consuming adulterated liquor contains.

Detailed Solution for Carbon & its Compounds - 2 - Question 4

Methanol causes blindness and even death. It is also known as denatured alcohol.

Carbon & its Compounds - 2 - Question 5

The first member of alkyne homologous series is

Detailed Solution for Carbon & its Compounds - 2 - Question 5

The smallest alkyne contains two carbon atoms with a triple bond between them.

Carbon & its Compounds - 2 - Question 6

The alcoholic drinks contain

Detailed Solution for Carbon & its Compounds - 2 - Question 6

CH3CH2OH is present in alcoholic drinks. It is known as ethanol which is prepared by fermentation of sugar (molasses).

Carbon & its Compounds - 2 - Question 7

Which of the following is not a straight chain hydrocarbon ?

Detailed Solution for Carbon & its Compounds - 2 - Question 7

Compounds (a), (b) and (c) can be written as straight chain compounds but compound (d) is really a branched chain compound

Carbon & its Compounds - 2 - Question 8

Ethanol reacts with Na metal to form

Detailed Solution for Carbon & its Compounds - 2 - Question 8

C2H5OH + 2Na → C2H5ONa + H2

Carbon & its Compounds - 2 - Question 9

Which of the following does not belong to the same homologous series ?

Detailed Solution for Carbon & its Compounds - 2 - Question 9

Compounds (a), (b) and (c) are saturated hydrocarbons but compound (d) is unsaturated. Compounds of the same homologous series have the same general formula.

Carbon & its Compounds - 2 - Question 10

The heteroatoms present in
CH3—CH2—O—CH2—CH2Cl are
(i) oxygen
(ii) carbon
(iii) hydrogen
(iv) chlorine

Detailed Solution for Carbon & its Compounds - 2 - Question 10

The atoms other than hydrogen and carbon are called heteroatoms.

Carbon & its Compounds - 2 - Question 11

The correct electron dot structure of a water molecule is

Detailed Solution for Carbon & its Compounds - 2 - Question 11

Oxygen atom has 6 valence electrons out of which 2 are involved in bonding with the 2 hydrogen atoms. Therefore water molecules has 2 bond pair of electrons and 2 lone pair(non bonded) of electrons and the correct electronic structure is (C).

Carbon & its Compounds - 2 - Question 12

Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g., hydrogen. After the formation of four bonds, carbon attains the electronic configuration of

Detailed Solution for Carbon & its Compounds - 2 - Question 12

After sharing four electrons with four univalent atoms, carbon has 6 + 4 = 10 electrons.
Neon also contains 10 electrons

Carbon & its Compounds - 2 - Question 13

Vinegar is a solution of

Detailed Solution for Carbon & its Compounds - 2 - Question 13

Vinegar is a diluted solution of acetic acid in water. It’s composition is 5% - 8% of acetic acid in water.

Carbon & its Compounds - 2 - Question 14

The name of the compound CH3 - CH2 - CHO is

Detailed Solution for Carbon & its Compounds - 2 - Question 14

It contains a total of three carbon atoms with an aldehyde group. Propane + al = propanal.

Carbon & its Compounds - 2 - Question 15

Ethanol reacts with sodium and forms two products. These are

Detailed Solution for Carbon & its Compounds - 2 - Question 15

The equation for the reaction between sodium and ethanol can be written as:


2CH3​CH2​OH+2Na→2CH3​CH2​ONa+H2​


Therefore, the products formed are sodium ethoxide and hydrogen

Carbon & its Compounds - 2 - Question 16

Mineral acids are stronger acids than carboxylic acids because
(i) mineral acids are completely ionised.
(ii) carboxylic acids are completely ionised.
(iii) mineral acids are partially ionised.
(iv) carboxylic acids are partially ionised.

Detailed Solution for Carbon & its Compounds - 2 - Question 16

It is well known that mineral acids are completely ionised while carboxylic acids are partially ionised

Carbon & its Compounds - 2 - Question 17

Pentane has the molecular formula C5H12. It has

Detailed Solution for Carbon & its Compounds - 2 - Question 17

Carbon & its Compounds - 2 - Question 18

Most carbon compounds

Detailed Solution for Carbon & its Compounds - 2 - Question 18

Organic compounds have covalent bonding in their molecules. Such compounds are poor conductors of electricity and have low boiling points.

Carbon & its Compounds - 2 - Question 19

Chlorine reacts with saturated hydrocarbons at room temperature in the

Carbon & its Compounds - 2 - Question 20

Ethane with the molecular formula C2H6 has

Detailed Solution for Carbon & its Compounds - 2 - Question 20

  There are 7 covalent bonds in the compound.

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