323978
Assertion : In formaldehyde, all the four atoms are in same plane. Reason : The carbon atom in formaldehyde is \(\mathrm{sp}^{2}\) hybridised.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The central carbon atom is \(\mathrm{sp}^{2}\) hybridized, forming two sigma bonds with hydrogen atoms, and a pi bond with an oxygen atom, It has trigonal planar geometry with bond angles of approximately \(120^{\circ}\). So the option (1) is correct.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323979
Which of the following statements is true for carbonyl group?
1 The carbonyl bond is weaker as compared to double bond in alkene.
2 C-C-O bond angle is \(90^{\circ}\).
3 Carbon atom forms three sigma bonds.
4 Carbon atom is \(\mathrm{sp}^{3}\) hybridised.
Explanation:
In carbonyl group, carbon atom forms three sigma bonds. It can be easily shown as below: The carbonyl carbon atom is \(\mathrm{sp}^{2}\)-hybridised contributes one electron to each of three hybrid orbitals, forming three sigma \((\sigma)\) bonds. The \(\pi\) - electron cloud is above and below the plane. The bond angles are approximately \(120^{\circ}\) as expected of a trigonal planar structure. Because of the greater electronegativity of oxygen, the carbonyl group is polar and form stable bond in comparison with non-polar double bond of alkene.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323980
The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha carbon, is?
1 A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.
2 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.
3 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.
4 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.
Explanation:
Keto-enol tautomerism is possible only in those aldehydes and ketones which have at least one \({\rm{\alpha }}\)-hydrogen atom, which can convert the ketonic group to the enolic group. e.g.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323981
Statement A : The carbonyl carbon is a nucleophilic and carbonyl oxygen is an electrophilic centre. Statement B : The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon. The carbonyl carbon is an electrophilic (Lewis acid) and the carbonyl oxygen is a nucleophilic (Lewis base) centre.
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CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323978
Assertion : In formaldehyde, all the four atoms are in same plane. Reason : The carbon atom in formaldehyde is \(\mathrm{sp}^{2}\) hybridised.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The central carbon atom is \(\mathrm{sp}^{2}\) hybridized, forming two sigma bonds with hydrogen atoms, and a pi bond with an oxygen atom, It has trigonal planar geometry with bond angles of approximately \(120^{\circ}\). So the option (1) is correct.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323979
Which of the following statements is true for carbonyl group?
1 The carbonyl bond is weaker as compared to double bond in alkene.
2 C-C-O bond angle is \(90^{\circ}\).
3 Carbon atom forms three sigma bonds.
4 Carbon atom is \(\mathrm{sp}^{3}\) hybridised.
Explanation:
In carbonyl group, carbon atom forms three sigma bonds. It can be easily shown as below: The carbonyl carbon atom is \(\mathrm{sp}^{2}\)-hybridised contributes one electron to each of three hybrid orbitals, forming three sigma \((\sigma)\) bonds. The \(\pi\) - electron cloud is above and below the plane. The bond angles are approximately \(120^{\circ}\) as expected of a trigonal planar structure. Because of the greater electronegativity of oxygen, the carbonyl group is polar and form stable bond in comparison with non-polar double bond of alkene.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323980
The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha carbon, is?
1 A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.
2 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.
3 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.
4 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.
Explanation:
Keto-enol tautomerism is possible only in those aldehydes and ketones which have at least one \({\rm{\alpha }}\)-hydrogen atom, which can convert the ketonic group to the enolic group. e.g.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323981
Statement A : The carbonyl carbon is a nucleophilic and carbonyl oxygen is an electrophilic centre. Statement B : The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon. The carbonyl carbon is an electrophilic (Lewis acid) and the carbonyl oxygen is a nucleophilic (Lewis base) centre.
323978
Assertion : In formaldehyde, all the four atoms are in same plane. Reason : The carbon atom in formaldehyde is \(\mathrm{sp}^{2}\) hybridised.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The central carbon atom is \(\mathrm{sp}^{2}\) hybridized, forming two sigma bonds with hydrogen atoms, and a pi bond with an oxygen atom, It has trigonal planar geometry with bond angles of approximately \(120^{\circ}\). So the option (1) is correct.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323979
Which of the following statements is true for carbonyl group?
1 The carbonyl bond is weaker as compared to double bond in alkene.
2 C-C-O bond angle is \(90^{\circ}\).
3 Carbon atom forms three sigma bonds.
4 Carbon atom is \(\mathrm{sp}^{3}\) hybridised.
Explanation:
In carbonyl group, carbon atom forms three sigma bonds. It can be easily shown as below: The carbonyl carbon atom is \(\mathrm{sp}^{2}\)-hybridised contributes one electron to each of three hybrid orbitals, forming three sigma \((\sigma)\) bonds. The \(\pi\) - electron cloud is above and below the plane. The bond angles are approximately \(120^{\circ}\) as expected of a trigonal planar structure. Because of the greater electronegativity of oxygen, the carbonyl group is polar and form stable bond in comparison with non-polar double bond of alkene.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323980
The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha carbon, is?
1 A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.
2 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.
3 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.
4 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.
Explanation:
Keto-enol tautomerism is possible only in those aldehydes and ketones which have at least one \({\rm{\alpha }}\)-hydrogen atom, which can convert the ketonic group to the enolic group. e.g.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323981
Statement A : The carbonyl carbon is a nucleophilic and carbonyl oxygen is an electrophilic centre. Statement B : The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon. The carbonyl carbon is an electrophilic (Lewis acid) and the carbonyl oxygen is a nucleophilic (Lewis base) centre.
323978
Assertion : In formaldehyde, all the four atoms are in same plane. Reason : The carbon atom in formaldehyde is \(\mathrm{sp}^{2}\) hybridised.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The central carbon atom is \(\mathrm{sp}^{2}\) hybridized, forming two sigma bonds with hydrogen atoms, and a pi bond with an oxygen atom, It has trigonal planar geometry with bond angles of approximately \(120^{\circ}\). So the option (1) is correct.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323979
Which of the following statements is true for carbonyl group?
1 The carbonyl bond is weaker as compared to double bond in alkene.
2 C-C-O bond angle is \(90^{\circ}\).
3 Carbon atom forms three sigma bonds.
4 Carbon atom is \(\mathrm{sp}^{3}\) hybridised.
Explanation:
In carbonyl group, carbon atom forms three sigma bonds. It can be easily shown as below: The carbonyl carbon atom is \(\mathrm{sp}^{2}\)-hybridised contributes one electron to each of three hybrid orbitals, forming three sigma \((\sigma)\) bonds. The \(\pi\) - electron cloud is above and below the plane. The bond angles are approximately \(120^{\circ}\) as expected of a trigonal planar structure. Because of the greater electronegativity of oxygen, the carbonyl group is polar and form stable bond in comparison with non-polar double bond of alkene.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323980
The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha carbon, is?
1 A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.
2 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.
3 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.
4 A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.
Explanation:
Keto-enol tautomerism is possible only in those aldehydes and ketones which have at least one \({\rm{\alpha }}\)-hydrogen atom, which can convert the ketonic group to the enolic group. e.g.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323981
Statement A : The carbonyl carbon is a nucleophilic and carbonyl oxygen is an electrophilic centre. Statement B : The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon. The carbonyl carbon is an electrophilic (Lewis acid) and the carbonyl oxygen is a nucleophilic (Lewis base) centre.
