322979
Solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a colour.
1 orange-red
2 green
3 blue
4 yellow
Explanation:
A solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a blue colour.
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322980
Statement A : In Lucas test, \(3^{\circ}\) alcohols react immediately. Statement B : An equimolar mixture of anhyd. \(\mathrm{ZnCl}_{2}\) and conc. \(\mathrm{HCl}\) is called Lucas reagent.
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:
In Lucas test, tertiary alcohols react immediately because of the formation of the more stable tertiary carbocations.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322981
The alcohol that produce turbidity immediately with Lucas reagent at room temperature is
1 1 - Hydroxybutane
2 2 - Hydroxybutane
3 2 - Hydroxy - 2 - methylpropane
4 1 - Hydroxy - 2 - methylpropane
Explanation:
Tertiary alcohol gives turbidity immediately with Lucas reagent. 2-Hydroxy-2-methylpropane is a tertiary alcohol. Lucas reagent is Conc. \(\mathrm{HCl}+\) anhy. \(\mathrm{ZnCl}_{2}\)
AIIMS - 2012
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322982
Lucas test is associated with
1 phenol
2 carboxylic acid
3 alcohols
4 aldehydes
Explanation:
Lucas test is employed to distinguish between \(1^{0}, 2^{0}\) and \(3^{0}\) alcohols. Lucas reagent, i.e., conc. \(\mathrm{HCl}\) and anhyd. \(\mathrm{ZnCl}_{2}\), is added to alcohols and the appearance of turbidity due to formation of alkyl chloride helps in the distinction of alcohols. If turbidity appears immediately, alcohol is tertiary. If turbidity appears in \(5 \mathrm{~min}\), alcohol is secondary. If solution remains clear, i.e., no turbidity, alcohol is primary.
KCET - 2009
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322983
What is the correct order of reactivity of alcohols in the following reaction? \({\text{R - OH + HCl}}\xrightarrow{{{\text{ZnC}}{{\text{l}}_{\text{2}}}}}{\text{R - Cl + }}{{\text{H}}_{\text{2}}}{\text{O}}\)
1 \(1^{\circ}>2^{\circ}>3^{\circ}\)
2 \(1^{\circ} < 2^{\circ}>3^{\circ}\)
3 \(3^{\circ}>2^{\circ}>1^{\circ}\)
4 \(3^{\circ}>1^{\circ}>2^{\circ}\)
Explanation:
\(\mathrm{HCl}+\mathrm{ZnCl}_{2}\) is known as Lucas reagent. Reactivity of alcohol towards Lucas reagent depends upon stability of carbocation. More is the stability of the carbocation more is the reactivity of alcohols. Stability of carbocation : \(3^\circ > 2^\circ > 1^\circ \)
322979
Solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a colour.
1 orange-red
2 green
3 blue
4 yellow
Explanation:
A solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a blue colour.
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322980
Statement A : In Lucas test, \(3^{\circ}\) alcohols react immediately. Statement B : An equimolar mixture of anhyd. \(\mathrm{ZnCl}_{2}\) and conc. \(\mathrm{HCl}\) is called Lucas reagent.
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:
In Lucas test, tertiary alcohols react immediately because of the formation of the more stable tertiary carbocations.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322981
The alcohol that produce turbidity immediately with Lucas reagent at room temperature is
1 1 - Hydroxybutane
2 2 - Hydroxybutane
3 2 - Hydroxy - 2 - methylpropane
4 1 - Hydroxy - 2 - methylpropane
Explanation:
Tertiary alcohol gives turbidity immediately with Lucas reagent. 2-Hydroxy-2-methylpropane is a tertiary alcohol. Lucas reagent is Conc. \(\mathrm{HCl}+\) anhy. \(\mathrm{ZnCl}_{2}\)
AIIMS - 2012
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322982
Lucas test is associated with
1 phenol
2 carboxylic acid
3 alcohols
4 aldehydes
Explanation:
Lucas test is employed to distinguish between \(1^{0}, 2^{0}\) and \(3^{0}\) alcohols. Lucas reagent, i.e., conc. \(\mathrm{HCl}\) and anhyd. \(\mathrm{ZnCl}_{2}\), is added to alcohols and the appearance of turbidity due to formation of alkyl chloride helps in the distinction of alcohols. If turbidity appears immediately, alcohol is tertiary. If turbidity appears in \(5 \mathrm{~min}\), alcohol is secondary. If solution remains clear, i.e., no turbidity, alcohol is primary.
KCET - 2009
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322983
What is the correct order of reactivity of alcohols in the following reaction? \({\text{R - OH + HCl}}\xrightarrow{{{\text{ZnC}}{{\text{l}}_{\text{2}}}}}{\text{R - Cl + }}{{\text{H}}_{\text{2}}}{\text{O}}\)
1 \(1^{\circ}>2^{\circ}>3^{\circ}\)
2 \(1^{\circ} < 2^{\circ}>3^{\circ}\)
3 \(3^{\circ}>2^{\circ}>1^{\circ}\)
4 \(3^{\circ}>1^{\circ}>2^{\circ}\)
Explanation:
\(\mathrm{HCl}+\mathrm{ZnCl}_{2}\) is known as Lucas reagent. Reactivity of alcohol towards Lucas reagent depends upon stability of carbocation. More is the stability of the carbocation more is the reactivity of alcohols. Stability of carbocation : \(3^\circ > 2^\circ > 1^\circ \)
322979
Solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a colour.
1 orange-red
2 green
3 blue
4 yellow
Explanation:
A solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a blue colour.
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322980
Statement A : In Lucas test, \(3^{\circ}\) alcohols react immediately. Statement B : An equimolar mixture of anhyd. \(\mathrm{ZnCl}_{2}\) and conc. \(\mathrm{HCl}\) is called Lucas reagent.
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:
In Lucas test, tertiary alcohols react immediately because of the formation of the more stable tertiary carbocations.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322981
The alcohol that produce turbidity immediately with Lucas reagent at room temperature is
1 1 - Hydroxybutane
2 2 - Hydroxybutane
3 2 - Hydroxy - 2 - methylpropane
4 1 - Hydroxy - 2 - methylpropane
Explanation:
Tertiary alcohol gives turbidity immediately with Lucas reagent. 2-Hydroxy-2-methylpropane is a tertiary alcohol. Lucas reagent is Conc. \(\mathrm{HCl}+\) anhy. \(\mathrm{ZnCl}_{2}\)
AIIMS - 2012
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322982
Lucas test is associated with
1 phenol
2 carboxylic acid
3 alcohols
4 aldehydes
Explanation:
Lucas test is employed to distinguish between \(1^{0}, 2^{0}\) and \(3^{0}\) alcohols. Lucas reagent, i.e., conc. \(\mathrm{HCl}\) and anhyd. \(\mathrm{ZnCl}_{2}\), is added to alcohols and the appearance of turbidity due to formation of alkyl chloride helps in the distinction of alcohols. If turbidity appears immediately, alcohol is tertiary. If turbidity appears in \(5 \mathrm{~min}\), alcohol is secondary. If solution remains clear, i.e., no turbidity, alcohol is primary.
KCET - 2009
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322983
What is the correct order of reactivity of alcohols in the following reaction? \({\text{R - OH + HCl}}\xrightarrow{{{\text{ZnC}}{{\text{l}}_{\text{2}}}}}{\text{R - Cl + }}{{\text{H}}_{\text{2}}}{\text{O}}\)
1 \(1^{\circ}>2^{\circ}>3^{\circ}\)
2 \(1^{\circ} < 2^{\circ}>3^{\circ}\)
3 \(3^{\circ}>2^{\circ}>1^{\circ}\)
4 \(3^{\circ}>1^{\circ}>2^{\circ}\)
Explanation:
\(\mathrm{HCl}+\mathrm{ZnCl}_{2}\) is known as Lucas reagent. Reactivity of alcohol towards Lucas reagent depends upon stability of carbocation. More is the stability of the carbocation more is the reactivity of alcohols. Stability of carbocation : \(3^\circ > 2^\circ > 1^\circ \)
NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322979
Solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a colour.
1 orange-red
2 green
3 blue
4 yellow
Explanation:
A solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a blue colour.
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322980
Statement A : In Lucas test, \(3^{\circ}\) alcohols react immediately. Statement B : An equimolar mixture of anhyd. \(\mathrm{ZnCl}_{2}\) and conc. \(\mathrm{HCl}\) is called Lucas reagent.
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:
In Lucas test, tertiary alcohols react immediately because of the formation of the more stable tertiary carbocations.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322981
The alcohol that produce turbidity immediately with Lucas reagent at room temperature is
1 1 - Hydroxybutane
2 2 - Hydroxybutane
3 2 - Hydroxy - 2 - methylpropane
4 1 - Hydroxy - 2 - methylpropane
Explanation:
Tertiary alcohol gives turbidity immediately with Lucas reagent. 2-Hydroxy-2-methylpropane is a tertiary alcohol. Lucas reagent is Conc. \(\mathrm{HCl}+\) anhy. \(\mathrm{ZnCl}_{2}\)
AIIMS - 2012
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322982
Lucas test is associated with
1 phenol
2 carboxylic acid
3 alcohols
4 aldehydes
Explanation:
Lucas test is employed to distinguish between \(1^{0}, 2^{0}\) and \(3^{0}\) alcohols. Lucas reagent, i.e., conc. \(\mathrm{HCl}\) and anhyd. \(\mathrm{ZnCl}_{2}\), is added to alcohols and the appearance of turbidity due to formation of alkyl chloride helps in the distinction of alcohols. If turbidity appears immediately, alcohol is tertiary. If turbidity appears in \(5 \mathrm{~min}\), alcohol is secondary. If solution remains clear, i.e., no turbidity, alcohol is primary.
KCET - 2009
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322983
What is the correct order of reactivity of alcohols in the following reaction? \({\text{R - OH + HCl}}\xrightarrow{{{\text{ZnC}}{{\text{l}}_{\text{2}}}}}{\text{R - Cl + }}{{\text{H}}_{\text{2}}}{\text{O}}\)
1 \(1^{\circ}>2^{\circ}>3^{\circ}\)
2 \(1^{\circ} < 2^{\circ}>3^{\circ}\)
3 \(3^{\circ}>2^{\circ}>1^{\circ}\)
4 \(3^{\circ}>1^{\circ}>2^{\circ}\)
Explanation:
\(\mathrm{HCl}+\mathrm{ZnCl}_{2}\) is known as Lucas reagent. Reactivity of alcohol towards Lucas reagent depends upon stability of carbocation. More is the stability of the carbocation more is the reactivity of alcohols. Stability of carbocation : \(3^\circ > 2^\circ > 1^\circ \)
322979
Solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a colour.
1 orange-red
2 green
3 blue
4 yellow
Explanation:
A solution of \(\mathrm{CrO}_{5}\) in amyl alcohol has a blue colour.
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322980
Statement A : In Lucas test, \(3^{\circ}\) alcohols react immediately. Statement B : An equimolar mixture of anhyd. \(\mathrm{ZnCl}_{2}\) and conc. \(\mathrm{HCl}\) is called Lucas reagent.
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:
In Lucas test, tertiary alcohols react immediately because of the formation of the more stable tertiary carbocations.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322981
The alcohol that produce turbidity immediately with Lucas reagent at room temperature is
1 1 - Hydroxybutane
2 2 - Hydroxybutane
3 2 - Hydroxy - 2 - methylpropane
4 1 - Hydroxy - 2 - methylpropane
Explanation:
Tertiary alcohol gives turbidity immediately with Lucas reagent. 2-Hydroxy-2-methylpropane is a tertiary alcohol. Lucas reagent is Conc. \(\mathrm{HCl}+\) anhy. \(\mathrm{ZnCl}_{2}\)
AIIMS - 2012
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322982
Lucas test is associated with
1 phenol
2 carboxylic acid
3 alcohols
4 aldehydes
Explanation:
Lucas test is employed to distinguish between \(1^{0}, 2^{0}\) and \(3^{0}\) alcohols. Lucas reagent, i.e., conc. \(\mathrm{HCl}\) and anhyd. \(\mathrm{ZnCl}_{2}\), is added to alcohols and the appearance of turbidity due to formation of alkyl chloride helps in the distinction of alcohols. If turbidity appears immediately, alcohol is tertiary. If turbidity appears in \(5 \mathrm{~min}\), alcohol is secondary. If solution remains clear, i.e., no turbidity, alcohol is primary.
KCET - 2009
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
322983
What is the correct order of reactivity of alcohols in the following reaction? \({\text{R - OH + HCl}}\xrightarrow{{{\text{ZnC}}{{\text{l}}_{\text{2}}}}}{\text{R - Cl + }}{{\text{H}}_{\text{2}}}{\text{O}}\)
1 \(1^{\circ}>2^{\circ}>3^{\circ}\)
2 \(1^{\circ} < 2^{\circ}>3^{\circ}\)
3 \(3^{\circ}>2^{\circ}>1^{\circ}\)
4 \(3^{\circ}>1^{\circ}>2^{\circ}\)
Explanation:
\(\mathrm{HCl}+\mathrm{ZnCl}_{2}\) is known as Lucas reagent. Reactivity of alcohol towards Lucas reagent depends upon stability of carbocation. More is the stability of the carbocation more is the reactivity of alcohols. Stability of carbocation : \(3^\circ > 2^\circ > 1^\circ \)