323084
Assertion : \(\mathrm{HIO}_{4}\) cleaves 1.2 -glycols but not 1.3 - or higher glycols. Reason : Only 1, 2-glycols form cyclic esters which subsequently undergo cleavage to form carbonyl compounds.
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:
1,2-Glycols undergo efficient cleavage with periodic acid to form aldehydes or ketones, while 1,3- or higher glycols, with non-adjacent hydroxyl groups, exhibit less effective or no cleavage due to steric hindrance and other factors. So the option (1) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323085
Assertion : Hydroxylation of ethylene with Baeyer's reagent gives ethylene glycol. Reason : Baeyer's reagent is \(\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{FeSO}_{4}\).
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:
Baeyer's reagent, a pink alkaline solution of potassium permanganate, is utilized to detect the presence of unsaturation in organic compound. The color changes from pink to brown or green upon reduction .So the option (3) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323086
Assertion : Glycerol is purified by distillation under reduced pressure. Reason : Glycerol is a trihydric alcohol
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 Both Assertion and Reason are incorrect
Explanation:
Glycerol is a trihydric alcohol. It is purified by its distillation under reduced pressure because it decomposes below its boiling point.
AIIMS - 2013
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323087
Assertion : Dehydration of glycerol with \(\mathrm{KHSO}_{4}\) gives acrolein. Reason : Acrolein is an \(\alpha, \beta\)-unsaturated aldehyde.
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:
Glycerol when heated in the presence of potassium bisulphate(acid catalyzed dehydration) results in the removal of two units of water molecules to form \(\alpha, \beta\) - unsaturated aldehyde,also called as acryl aldehyde. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323088
Assertion : With excess of HI, glycerol ultimatelygives isopropyl iodide. Reason : The reaction occurs through intermediate formation of allyl iodide and propylene.
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.
323084
Assertion : \(\mathrm{HIO}_{4}\) cleaves 1.2 -glycols but not 1.3 - or higher glycols. Reason : Only 1, 2-glycols form cyclic esters which subsequently undergo cleavage to form carbonyl compounds.
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:
1,2-Glycols undergo efficient cleavage with periodic acid to form aldehydes or ketones, while 1,3- or higher glycols, with non-adjacent hydroxyl groups, exhibit less effective or no cleavage due to steric hindrance and other factors. So the option (1) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323085
Assertion : Hydroxylation of ethylene with Baeyer's reagent gives ethylene glycol. Reason : Baeyer's reagent is \(\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{FeSO}_{4}\).
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:
Baeyer's reagent, a pink alkaline solution of potassium permanganate, is utilized to detect the presence of unsaturation in organic compound. The color changes from pink to brown or green upon reduction .So the option (3) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323086
Assertion : Glycerol is purified by distillation under reduced pressure. Reason : Glycerol is a trihydric alcohol
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 Both Assertion and Reason are incorrect
Explanation:
Glycerol is a trihydric alcohol. It is purified by its distillation under reduced pressure because it decomposes below its boiling point.
AIIMS - 2013
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323087
Assertion : Dehydration of glycerol with \(\mathrm{KHSO}_{4}\) gives acrolein. Reason : Acrolein is an \(\alpha, \beta\)-unsaturated aldehyde.
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:
Glycerol when heated in the presence of potassium bisulphate(acid catalyzed dehydration) results in the removal of two units of water molecules to form \(\alpha, \beta\) - unsaturated aldehyde,also called as acryl aldehyde. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323088
Assertion : With excess of HI, glycerol ultimatelygives isopropyl iodide. Reason : The reaction occurs through intermediate formation of allyl iodide and propylene.
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.
323084
Assertion : \(\mathrm{HIO}_{4}\) cleaves 1.2 -glycols but not 1.3 - or higher glycols. Reason : Only 1, 2-glycols form cyclic esters which subsequently undergo cleavage to form carbonyl compounds.
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:
1,2-Glycols undergo efficient cleavage with periodic acid to form aldehydes or ketones, while 1,3- or higher glycols, with non-adjacent hydroxyl groups, exhibit less effective or no cleavage due to steric hindrance and other factors. So the option (1) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323085
Assertion : Hydroxylation of ethylene with Baeyer's reagent gives ethylene glycol. Reason : Baeyer's reagent is \(\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{FeSO}_{4}\).
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:
Baeyer's reagent, a pink alkaline solution of potassium permanganate, is utilized to detect the presence of unsaturation in organic compound. The color changes from pink to brown or green upon reduction .So the option (3) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323086
Assertion : Glycerol is purified by distillation under reduced pressure. Reason : Glycerol is a trihydric alcohol
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 Both Assertion and Reason are incorrect
Explanation:
Glycerol is a trihydric alcohol. It is purified by its distillation under reduced pressure because it decomposes below its boiling point.
AIIMS - 2013
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323087
Assertion : Dehydration of glycerol with \(\mathrm{KHSO}_{4}\) gives acrolein. Reason : Acrolein is an \(\alpha, \beta\)-unsaturated aldehyde.
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:
Glycerol when heated in the presence of potassium bisulphate(acid catalyzed dehydration) results in the removal of two units of water molecules to form \(\alpha, \beta\) - unsaturated aldehyde,also called as acryl aldehyde. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323088
Assertion : With excess of HI, glycerol ultimatelygives isopropyl iodide. Reason : The reaction occurs through intermediate formation of allyl iodide and propylene.
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.
323084
Assertion : \(\mathrm{HIO}_{4}\) cleaves 1.2 -glycols but not 1.3 - or higher glycols. Reason : Only 1, 2-glycols form cyclic esters which subsequently undergo cleavage to form carbonyl compounds.
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:
1,2-Glycols undergo efficient cleavage with periodic acid to form aldehydes or ketones, while 1,3- or higher glycols, with non-adjacent hydroxyl groups, exhibit less effective or no cleavage due to steric hindrance and other factors. So the option (1) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323085
Assertion : Hydroxylation of ethylene with Baeyer's reagent gives ethylene glycol. Reason : Baeyer's reagent is \(\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{FeSO}_{4}\).
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:
Baeyer's reagent, a pink alkaline solution of potassium permanganate, is utilized to detect the presence of unsaturation in organic compound. The color changes from pink to brown or green upon reduction .So the option (3) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323086
Assertion : Glycerol is purified by distillation under reduced pressure. Reason : Glycerol is a trihydric alcohol
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 Both Assertion and Reason are incorrect
Explanation:
Glycerol is a trihydric alcohol. It is purified by its distillation under reduced pressure because it decomposes below its boiling point.
AIIMS - 2013
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323087
Assertion : Dehydration of glycerol with \(\mathrm{KHSO}_{4}\) gives acrolein. Reason : Acrolein is an \(\alpha, \beta\)-unsaturated aldehyde.
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:
Glycerol when heated in the presence of potassium bisulphate(acid catalyzed dehydration) results in the removal of two units of water molecules to form \(\alpha, \beta\) - unsaturated aldehyde,also called as acryl aldehyde. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323088
Assertion : With excess of HI, glycerol ultimatelygives isopropyl iodide. Reason : The reaction occurs through intermediate formation of allyl iodide and propylene.
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.
323084
Assertion : \(\mathrm{HIO}_{4}\) cleaves 1.2 -glycols but not 1.3 - or higher glycols. Reason : Only 1, 2-glycols form cyclic esters which subsequently undergo cleavage to form carbonyl compounds.
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:
1,2-Glycols undergo efficient cleavage with periodic acid to form aldehydes or ketones, while 1,3- or higher glycols, with non-adjacent hydroxyl groups, exhibit less effective or no cleavage due to steric hindrance and other factors. So the option (1) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323085
Assertion : Hydroxylation of ethylene with Baeyer's reagent gives ethylene glycol. Reason : Baeyer's reagent is \(\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{FeSO}_{4}\).
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:
Baeyer's reagent, a pink alkaline solution of potassium permanganate, is utilized to detect the presence of unsaturation in organic compound. The color changes from pink to brown or green upon reduction .So the option (3) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323086
Assertion : Glycerol is purified by distillation under reduced pressure. Reason : Glycerol is a trihydric alcohol
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 Both Assertion and Reason are incorrect
Explanation:
Glycerol is a trihydric alcohol. It is purified by its distillation under reduced pressure because it decomposes below its boiling point.
AIIMS - 2013
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323087
Assertion : Dehydration of glycerol with \(\mathrm{KHSO}_{4}\) gives acrolein. Reason : Acrolein is an \(\alpha, \beta\)-unsaturated aldehyde.
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:
Glycerol when heated in the presence of potassium bisulphate(acid catalyzed dehydration) results in the removal of two units of water molecules to form \(\alpha, \beta\) - unsaturated aldehyde,also called as acryl aldehyde. So the option (2) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323088
Assertion : With excess of HI, glycerol ultimatelygives isopropyl iodide. Reason : The reaction occurs through intermediate formation of allyl iodide and propylene.
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.
