10th Grade > Chemistry
CARBON AND ITS COMPOUNDS MCQs
Total Questions : 56
| Page 2 of 6 pages
Answer: Option A. -> Methanol
:
A
Methanol (CH3OH) is added to denature ethanol.
Denatured alcohol, also called methylated spirits has additives to make it poisonous, extremely bad tasting, foul smelling or nauseating. This is done in order to discourage its recreational consumption.
:
A
Methanol (CH3OH) is added to denature ethanol.
Denatured alcohol, also called methylated spirits has additives to make it poisonous, extremely bad tasting, foul smelling or nauseating. This is done in order to discourage its recreational consumption.
Answer: Option C. -> prop
:
C
The word roots are selected based on the number of carbon atoms in the parent chain of the hydrocarbon. Given below are few word roots corresponding to the number of carbon atoms in the parent chain of the hydrocarbon.
Number of carbon atomsWord rootOneMethTwoEthThreePropFourBut
:
C
The word roots are selected based on the number of carbon atoms in the parent chain of the hydrocarbon. Given below are few word roots corresponding to the number of carbon atoms in the parent chain of the hydrocarbon.
Number of carbon atomsWord rootOneMethTwoEthThreePropFourBut
Answer: Option B. -> Saturated compounds- clean or blue flame, Unsaturated compounds - yellow flame.
:
B
:
B
- Saturated hydrocarbons have a low percentage composition of carbon in them. So, the atmospheric oxygen is enough to burn all the carbon present. Therefore, these compounds give clean or blue flame.
- In unsaturated carbons, the percentage composition of carbon is highand the atmospheric oxygen is not enough to burn all the carbon present. The yellow flame is caused by the glow of hot unburnt carbon particles produced due to incomplete combustion..
Answer: Option B. -> Successive members of a homologous series differ by a CH3 group.
:
B
The characteristics of homologous series are:
(1) The members can be represented by the same general formula. For example, CnH2n for alkenes.
(2) Successive member differs by a CH2 group andnot by a CH3 group.
(3) Members show similarity in chemical properties.
(4) There is a regular gradation in physical properties. For example, in alkanes as 'n' value increases, their boiling point increases.
:
B
The characteristics of homologous series are:
(1) The members can be represented by the same general formula. For example, CnH2n for alkenes.
(2) Successive member differs by a CH2 group andnot by a CH3 group.
(3) Members show similarity in chemical properties.
(4) There is a regular gradation in physical properties. For example, in alkanes as 'n' value increases, their boiling point increases.
Answer: Option B. -> Two
:
B
Ethyne (C2H2) has two carbon-hydrogen single bonds and one carbon-carbon triple bond.
The structureofethyne is H−C≡C−H.
:
B
Ethyne (C2H2) has two carbon-hydrogen single bonds and one carbon-carbon triple bond.
The structureofethyne is H−C≡C−H.
Answer: Option C. -> Methanol and propanoic acid
:
C
Esters are obtained from the reaction between carboxylic acid and alcohols.The reaction between methanoland propanoic acid in the presence of concentrated sulphuric acid leads to the formation of methyl propanoate, an ester.
CH3OH(aq)+CH3CH2COOH(aq)→CH3CH2COOCH3(aq)+H2O(l)
:
C
Esters are obtained from the reaction between carboxylic acid and alcohols.The reaction between methanoland propanoic acid in the presence of concentrated sulphuric acid leads to the formation of methyl propanoate, an ester.
CH3OH(aq)+CH3CH2COOH(aq)→CH3CH2COOCH3(aq)+H2O(l)
Answer: Option B. -> ethene
:
B
In the given situation, concentrated sulphuric acid act as a dehydrating agent.
When ethanol is heated at 443 K with excess concentrated sulphuric acid, it causes its dehydration (loss of water). This results in the formation of ethene.
The reaction occurs as follows:
CH3CH2OH(aq)Hot Conc.−−−−−−→H2SO4CH2=CH2(g)+H2O(l)
:
B
In the given situation, concentrated sulphuric acid act as a dehydrating agent.
When ethanol is heated at 443 K with excess concentrated sulphuric acid, it causes its dehydration (loss of water). This results in the formation of ethene.
The reaction occurs as follows:
CH3CH2OH(aq)Hot Conc.−−−−−−→H2SO4CH2=CH2(g)+H2O(l)
Answer: Option C. -> but-2-yne
:
C
The given compound can be numbered as shown below.
∙ There are four carbon atoms in the parent chain (the longest carbon chain) and hence, the root word is 'but'.
∙ A triple bond is present between the second and third carbon atoms of the chain. Hence, it is an alkyne and the suffix will be '2-yne'.
Therefore, the IUPAC name of the given compound is but-2-yne.
:
C
The given compound can be numbered as shown below.
∙ There are four carbon atoms in the parent chain (the longest carbon chain) and hence, the root word is 'but'.
∙ A triple bond is present between the second and third carbon atoms of the chain. Hence, it is an alkyne and the suffix will be '2-yne'.
Therefore, the IUPAC name of the given compound is but-2-yne.
Answer: Option C. -> CnH2n−2
:
C
∙ Alkynes are hydrocarbons having atleast one triple bond between its carbon atoms. The general formula for alkynes is CnH2n−2.
∙ Alkanes are hydrocarbons having only single bonds between its carbon atoms. The general formula for alkanes isCnH2n+2.
∙ Alkenes are hydrocarbons having atleast one double bond between its carbon atoms. The general formula for alkenes is CnH2n.
:
C
∙ Alkynes are hydrocarbons having atleast one triple bond between its carbon atoms. The general formula for alkynes is CnH2n−2.
∙ Alkanes are hydrocarbons having only single bonds between its carbon atoms. The general formula for alkanes isCnH2n+2.
∙ Alkenes are hydrocarbons having atleast one double bond between its carbon atoms. The general formula for alkenes is CnH2n.
Answer: Option A. -> CH3COOH
:
A
Any carboxylic acid on reaction with an alcohol in presence of concentrated sulphuric acid gives an ester.
In the given options, only CH3COOH, i.e., ethanoic acid on reaction with ethanol in presence of concentratedsulphuric acid will give an ester (ethyl ethanoate).
This reaction is called esterification reaction.
CH3COOH(aq)+CH3CH2OH(aq)conc.H2SO4−−−−−−→CH3CH2COOCH3(aq)+H2O(aq)
:
A
Any carboxylic acid on reaction with an alcohol in presence of concentrated sulphuric acid gives an ester.
In the given options, only CH3COOH, i.e., ethanoic acid on reaction with ethanol in presence of concentratedsulphuric acid will give an ester (ethyl ethanoate).
This reaction is called esterification reaction.
CH3COOH(aq)+CH3CH2OH(aq)conc.H2SO4−−−−−−→CH3CH2COOCH3(aq)+H2O(aq)
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