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CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322979 Solution of ${CrO}_{5}$ in amyl alcohol has a colour.

1 orange-red

2 green

3 blue

4 yellow

Explanation:

A solution of ${CrO}_{5}$ 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. ${ZnCl}_{2}$ and conc. $HCl$ 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.

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. $HCl +$ anhy. ${ZnCl}_{2}$

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. $HCl$ and anhyd. ${ZnCl}_{2}$ , 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 $5 \min$ , 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?
$R - OH + HCl \overset{ZnC l_{2}}{\to} R - Cl + H_{2} O$

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:

$HCl + {ZnCl}_{2}$ 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 : $3^{\circ} > 2^{\circ} > 1^{\circ}$

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322979 Solution of ${CrO}_{5}$ in amyl alcohol has a colour.

1 orange-red

2 green

3 blue

4 yellow

Explanation:

A solution of ${CrO}_{5}$ 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. ${ZnCl}_{2}$ and conc. $HCl$ 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.

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. $HCl +$ anhy. ${ZnCl}_{2}$

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. $HCl$ and anhyd. ${ZnCl}_{2}$ , 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 $5 \min$ , 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?
$R - OH + HCl \overset{ZnC l_{2}}{\to} R - Cl + H_{2} O$

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:

$HCl + {ZnCl}_{2}$ 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 : $3^{\circ} > 2^{\circ} > 1^{\circ}$

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322979 Solution of ${CrO}_{5}$ in amyl alcohol has a colour.

1 orange-red

2 green

3 blue

4 yellow

Explanation:

A solution of ${CrO}_{5}$ 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. ${ZnCl}_{2}$ and conc. $HCl$ 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.

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. $HCl +$ anhy. ${ZnCl}_{2}$

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. $HCl$ and anhyd. ${ZnCl}_{2}$ , 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 $5 \min$ , 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?
$R - OH + HCl \overset{ZnC l_{2}}{\to} R - Cl + H_{2} O$

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:

$HCl + {ZnCl}_{2}$ 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 : $3^{\circ} > 2^{\circ} > 1^{\circ}$

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322979 Solution of ${CrO}_{5}$ in amyl alcohol has a colour.

1 orange-red

2 green

3 blue

4 yellow

Explanation:

A solution of ${CrO}_{5}$ 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. ${ZnCl}_{2}$ and conc. $HCl$ 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.

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. $HCl +$ anhy. ${ZnCl}_{2}$

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. $HCl$ and anhyd. ${ZnCl}_{2}$ , 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 $5 \min$ , 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?
$R - OH + HCl \overset{ZnC l_{2}}{\to} R - Cl + H_{2} O$

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:

$HCl + {ZnCl}_{2}$ 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 : $3^{\circ} > 2^{\circ} > 1^{\circ}$

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

322979 Solution of ${CrO}_{5}$ in amyl alcohol has a colour.

1 orange-red

2 green

3 blue

4 yellow

Explanation:

A solution of ${CrO}_{5}$ 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. ${ZnCl}_{2}$ and conc. $HCl$ 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.

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. $HCl +$ anhy. ${ZnCl}_{2}$

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. $HCl$ and anhyd. ${ZnCl}_{2}$ , 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 $5 \min$ , 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?
$R - OH + HCl \overset{ZnC l_{2}}{\to} R - Cl + H_{2} O$

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:

$HCl + {ZnCl}_{2}$ 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 : $3^{\circ} > 2^{\circ} > 1^{\circ}$

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