Chemical Reactions of Aldehydes and Ketones
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CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323453 When propanal reacts with 2-Methyl propanal in presence of \(\mathrm{NaOH}\), four different products (excluding stereo isomers) are formed. The reaction is known as:

1 Aldol condensation
2 Crossed aldol condensation
3 Cannizzaro reaction
4 HVZ condensation
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323454 Assertion :
Crossed aldol condensation of ethanal and propanal gives a mixture of four products.
Reason :
Ethanal and propanal, both contain \(\alpha\) hydrogen atom.

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.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323455 \({\text{C}}{{\text{H}}_{\text{3}}}{\text{COC}}{{\text{H}}_{\text{3}}}\xrightarrow[{{\text{(ii)dil}} \cdot {{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}}]{{\left( {\text{i}} \right){\mkern 1mu} {\mkern 1mu} {\text{Ba}}{\mkern 1mu} {\mkern 1mu} {{\left( {{\text{OH}}} \right)}_{\text{2}}}}}\)
The true statement about the product is

1 It contains three \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) carbons, two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) and one sp hybridised carbon
2 It contains three \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons and three \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridized carbons
3 It contains two \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons, two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised carbons and two \(\mathrm{sp}\) hybridised carbons
4 It contains four \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons and two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised carbons
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323456 Through which of the following reactions number of carbon atoms can be increased in the chain?

1 Wolff Kishner reduction
2 Cannizaro's reaction
3 Aldol condensation
4 HVZ reaction
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CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323453 When propanal reacts with 2-Methyl propanal in presence of \(\mathrm{NaOH}\), four different products (excluding stereo isomers) are formed. The reaction is known as:

1 Aldol condensation
2 Crossed aldol condensation
3 Cannizzaro reaction
4 HVZ condensation
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323454 Assertion :
Crossed aldol condensation of ethanal and propanal gives a mixture of four products.
Reason :
Ethanal and propanal, both contain \(\alpha\) hydrogen atom.

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.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323455 \({\text{C}}{{\text{H}}_{\text{3}}}{\text{COC}}{{\text{H}}_{\text{3}}}\xrightarrow[{{\text{(ii)dil}} \cdot {{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}}]{{\left( {\text{i}} \right){\mkern 1mu} {\mkern 1mu} {\text{Ba}}{\mkern 1mu} {\mkern 1mu} {{\left( {{\text{OH}}} \right)}_{\text{2}}}}}\)
The true statement about the product is

1 It contains three \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) carbons, two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) and one sp hybridised carbon
2 It contains three \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons and three \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridized carbons
3 It contains two \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons, two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised carbons and two \(\mathrm{sp}\) hybridised carbons
4 It contains four \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons and two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised carbons
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323456 Through which of the following reactions number of carbon atoms can be increased in the chain?

1 Wolff Kishner reduction
2 Cannizaro's reaction
3 Aldol condensation
4 HVZ reaction
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CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323453 When propanal reacts with 2-Methyl propanal in presence of \(\mathrm{NaOH}\), four different products (excluding stereo isomers) are formed. The reaction is known as:

1 Aldol condensation
2 Crossed aldol condensation
3 Cannizzaro reaction
4 HVZ condensation
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323454 Assertion :
Crossed aldol condensation of ethanal and propanal gives a mixture of four products.
Reason :
Ethanal and propanal, both contain \(\alpha\) hydrogen atom.

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.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323455 \({\text{C}}{{\text{H}}_{\text{3}}}{\text{COC}}{{\text{H}}_{\text{3}}}\xrightarrow[{{\text{(ii)dil}} \cdot {{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}}]{{\left( {\text{i}} \right){\mkern 1mu} {\mkern 1mu} {\text{Ba}}{\mkern 1mu} {\mkern 1mu} {{\left( {{\text{OH}}} \right)}_{\text{2}}}}}\)
The true statement about the product is

1 It contains three \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) carbons, two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) and one sp hybridised carbon
2 It contains three \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons and three \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridized carbons
3 It contains two \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons, two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised carbons and two \(\mathrm{sp}\) hybridised carbons
4 It contains four \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons and two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised carbons
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323456 Through which of the following reactions number of carbon atoms can be increased in the chain?

1 Wolff Kishner reduction
2 Cannizaro's reaction
3 Aldol condensation
4 HVZ reaction
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CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323453 When propanal reacts with 2-Methyl propanal in presence of \(\mathrm{NaOH}\), four different products (excluding stereo isomers) are formed. The reaction is known as:

1 Aldol condensation
2 Crossed aldol condensation
3 Cannizzaro reaction
4 HVZ condensation
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323454 Assertion :
Crossed aldol condensation of ethanal and propanal gives a mixture of four products.
Reason :
Ethanal and propanal, both contain \(\alpha\) hydrogen atom.

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.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323455 \({\text{C}}{{\text{H}}_{\text{3}}}{\text{COC}}{{\text{H}}_{\text{3}}}\xrightarrow[{{\text{(ii)dil}} \cdot {{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}}]{{\left( {\text{i}} \right){\mkern 1mu} {\mkern 1mu} {\text{Ba}}{\mkern 1mu} {\mkern 1mu} {{\left( {{\text{OH}}} \right)}_{\text{2}}}}}\)
The true statement about the product is

1 It contains three \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) carbons, two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) and one sp hybridised carbon
2 It contains three \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons and three \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridized carbons
3 It contains two \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons, two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised carbons and two \(\mathrm{sp}\) hybridised carbons
4 It contains four \({\rm{s}}{{\rm{p}}^{\rm{2}}}\) hybridised carbons and two \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised carbons
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323456 Through which of the following reactions number of carbon atoms can be increased in the chain?

1 Wolff Kishner reduction
2 Cannizaro's reaction
3 Aldol condensation
4 HVZ reaction
NCERT Exempler
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