Alcohols, Phenols & Ethers NEET Previous Year Questions for Practice

Q 11 :
When vapours of a secondary alcohol is passed over heated copper at 573 K, the product formed is [2019]

a carboxylic acid
an aldehyde
a ketone
an alkene

1

2

3

4

(3)

[IMAGE 120]

Q 12 :
In the reaction,

[IMAGE 121]

the electrophile involved is [2018]

dichloromethyl cation $(\overset{+}{C} {HCl}_{2})$
formyl cation $(\overset{+}{C} HO)$
dichloromethyl anion $(\bar{C} {HCl}_{2})$
dichlorocarbene $(: {CCl}_{2})$

1

2

3

4

(4)

It is Reimer–Tiemann reaction. The electrophile formed is dichlorocarbene $(: {CCl}_{2})$ which is formed according to the following mechanism:

[IMAGE 122]

Q 13 :
Compound A, $C_{8} H_{10} O$ , is found to react with $NaOI$ (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively [2018]

[IMAGE 123]
[IMAGE 124]
[IMAGE 125]
[IMAGE 126]

1

2

3

4

(3)

As the compound is giving yellow precipitate with $NaOI$ that shows it is undergoing haloform reaction. Haloform reaction is shown by the compounds having

[IMAGE 127]

Q 14 :
Identify the major products P, Q and R in the following sequence of reactions: [2018]

[IMAGE 128]

[IMAGE 129]
[IMAGE 130]
[IMAGE 131]
[IMAGE 132]

1

2

3

4

(4)

[IMAGE 133]

Q 15 :
Which one is the most acidic compound? [2017]

[IMAGE 134]
[IMAGE 135]
[IMAGE 136]
[IMAGE 137]

1

2

3

4

(3)

Electron withdrawing groups increase the acidity while electron donating groups decrease the acidity of phenol.

Q 16 :
Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group? [2015]

–COOH
– ${CHCl}_{2}$
–CHO
– ${CH}_{2} Cl$

1

2

3

4

(3)

This is Reimer–Tiemann reaction.

[IMAGE 138]

Q 17 :
Which of the following reaction(s) can be used for the preparation of alkyl halides? [2015]

(I)   ${CH}_{3} {CH}_{2} OH + HCl \overset{Anh . {ZnCl}_{2}}{\to}$
(II)   ${CH}_{3} {CH}_{2} OH + HCl \to$
(III)   ${({CH}_{3})}_{3} COH + HCl \to$
(IV)   ${({CH}_{3})}_{2} CHOH + HCl \overset{Anh . {ZnCl}_{2}}{\to}$

(I) and (II) only
(IV) only
(III) and (IV) only
(I), (III) and (IV) only

1

2

3

4

(4)

1° and 2° alcohols react with HCl in presence of anhydrous ${ZnCl}_{2}$ as catalyst while in case of 3° alcohols anhydrous ${ZnCl}_{2}$ is not required.

Q 18 :
Which of the following will not be soluble in sodium hydrogen carbonate? [2014]

2,4,6-Trinitrophenol
Benzoic acid
o-Nitrophenol
Benzenesulphonic acid

1

2

3

4

(3)

The reaction is as follows :

$Acid + {NaHCO}_{3} ⟶ \underset{(soluble)}{Sodium salt of acid} + H_{2} {CO}_{3}$

Among all the given compounds, o-nitrophenol is weaker acid than ${HCO}_{3}^{-}$ . Hence, it does not react with ${NaHCO}_{3} .$

Topic Question Set

Q 11 :
When vapours of a secondary alcohol is passed over heated copper at 573 K, the product formed is [2019]

Q 12 :
In the reaction,

[IMAGE 121]

the electrophile involved is [2018]

Q 13 :
Compound A, $C_{8} H_{10} O$ , is found to react with $NaOI$ (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively [2018]

Q 14 :
Identify the major products P, Q and R in the following sequence of reactions: [2018]

[IMAGE 128]

Q 15 :
Which one is the most acidic compound? [2017]

Q 16 :
Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group? [2015]

Q 18 :
Which of the following will not be soluble in sodium hydrogen carbonate? [2014]

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Topic Question Set

Q 11 : When vapours of a secondary alcohol is passed over heated copper at 573 K, the product formed is [2019]

Q 12 : In the reaction, [IMAGE 121] the electrophile involved is [2018]

Q 13 : Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively [2018]

Q 14 : Identify the major products P, Q and R in the following sequence of reactions: [2018] [IMAGE 128]

Q 15 : Which one is the most acidic compound? [2017]

Q 16 : Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group? [2015]

Q 17 : Which of the following reaction(s) can be used for the preparation of alkyl halides? [2015] (I) CH3CH2OH+HCl→Anh. ZnCl2 (II) CH3CH2OH+HCl→ (III) (CH3)3COH+HCl→ (IV) (CH3)2CHOH+HCl→Anh. ZnCl2

Q 18 : Which of the following will not be soluble in sodium hydrogen carbonate? [2014]

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Q 11 :
When vapours of a secondary alcohol is passed over heated copper at 573 K, the product formed is [2019]

Q 12 :
In the reaction,

[IMAGE 121]

the electrophile involved is [2018]

Q 13 :
Compound A, $C_{8} H_{10} O$ , is found to react with $NaOI$ (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively [2018]

Q 14 :
Identify the major products P, Q and R in the following sequence of reactions: [2018]

[IMAGE 128]

Q 15 :
Which one is the most acidic compound? [2017]

Q 16 :
Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group? [2015]

Q 18 :
Which of the following will not be soluble in sodium hydrogen carbonate? [2014]