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31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - NEET MCQ


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40 Questions MCQ Test Chemistry Class 12 - 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers for NEET 2024 is part of Chemistry Class 12 preparation. The 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers below.
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31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 1

What is the IUPAC name of the organic compound formed in the following chemical reaction ?   [2021]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 1

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 2

Anisole on cleavage with HI gives:   [2020]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 2

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31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 3

Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give: [2020]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 3

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 4

The structure of intermediate A in the following reaction, is    [2019]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 4

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 5

Phenol is distilled with Zn dust followed by Friedel Crafts alkylation with propyl chloride in the presence of AlCl3 to give a compound (B). (B) is oxidised in the presence of air to form the compound (C). The structural formula of (C) is [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 5

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 6

Which of the following compounds can be used as antifreeze in automobile radiators ? [2012 M]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 6

Glycol is used as an antifreeze in automobiles.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 7

In the following sequence of reactions            the end product (C) is :[2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 7

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 8

When glycerol is treated with excess of HI, it produces:                 [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 8

Glycerol when treated with excess HI produces  2–iodopropane

∴ Correct choice : (b)

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 9

Which one of the following compounds has the most acidic nature? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 9

The presence of electron withdrawing substituent increases the acidity while electron releasing substituent, when present, decrease the acidity.
Phenyl is an electron withdrawing substituent while -CH3 is an electron releasing substituent, Moreover, phenoxide ion is more resonance stabilised as compared to benzoyl oxide ion, thus, release proton more easily. That's why is a strong acid among the given.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 10

Consider the following reaction: [2009]


The product Z is:

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 10

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 11

Among the following four compounds[2010] (i) phenol (ii) methylphenol (iii) meta-nitrophenol (iv) para-nitrophenol the acidity order is :

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 11

(– I and – M effects, (only – I effect) both increase acidity)

(+ I effect of CH3 group decreases acidity)
∴ Correct choice : (b)

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 12

H2COH · CH2OH on heating with periodic acid gives:           [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 12

1, 2 – Diols, when treated with an aqueous solution of periodic acid give aldehyde or ketones

Note that a 1° alcohol gives CH2O. Since in glycol both the OH groups, are primary hence give 2 molecules of CH2O as by product.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 13

Consider the following reaction, [2009]the product Z is:

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 13

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 14

Ethylene oxide whent reated with Grignard reagent yields [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 14

Ethylene oxide when treated with Grignard Reagent gives primary alcohol.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 15

The major organic product in the reaction, CH3 — O — CH(CH3)2 + HI → Product is  [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 15

First HI will break into H+ and I-. Then H+ attacks on ether to form CH3O+HCH(CH3)2
Being an excellent nucleophile, I- attacks where it is easy to attack and so it will go for less bulky CH3 to form CH3I and (CH3)2CHOH.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 16

Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine? [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 16

CH3OH does not have -CH(OH)CH3 grouping hence it will not form yellow precipitate  with an alkaline solution of iodine (haloform reaction).

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 17

When phenol is treated with CHCl3 and NaOH, the product formed is [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 17

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 18

n-Propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent?

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 18

Primary alcohol on oxidation give aldehyde which on further oxidation give carboxylic acid whereas secondary alcohols give ketone.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 19

Which of the following is correct ? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 19

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 20

Propan - 1- ol may be prepared by the reaction of propene with [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 20

Hence C is correct.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 21

The ionization constant of phenol is higher than that of ethanol because : [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 21

The acidic nature of phenol is due to the formation of stable phenoxide ion in solution

The phenoxide ion is stable due to resonance.

The negative charge is delocalized in the benzene ring which is a stabilizing factor in the phenoxide ion and increase acidity of phenol. wheras no resonance is possible in alkoxide ions (RO)derived from alcohol. The negative charge is localized on oxygen atom.
Thus, alcohols are not acidic.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 22

1-Phenylethanol can be prepared by the reaction of benzaldehyde with [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 22

This is grignard reaction formation of 1-Phenylethanol 

takes place when benzaldehyde reacts with methyl iodide 

and magnesium followed by hydrolysis.

 

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 23

The stablest among the following is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 23

Due to –I-effect of the three C–Cl-bonding between CI and C-atom of the OH group, CCl3 CH (OH)2 is most stable.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 24

What is formed when a primary alcohol undergoes catalytic dehydrogenation ? [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 24

1° Alcohols on catalytic dehydrogenation give aldehydes.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 25

Which one of the following on oxidation gives a ketone ? [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 25

Secon dary alcoh ols on oxidation give ketones.
Note : – Primary alcohols from aldehydes.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 26

Increasing order of acid strength among p-methoxyphenol, p-methylphenol and p-nitrophenol is [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 26

Electron-donating groups (– OCH3, – CH3 etc.) tend to decrease and electron withdrawing groups (– NO2, – OCH3 etc.) tend to increase the acidic character of phenols. Since – OCH3 is a more powerful electron-donating group than – CH3 group, therefore, p-methylphenol is slightly more acidic than p-methoxyphenol while pnitrophenol is the strongest acid. Thus, option (d), i.e. p-methoxyphenol, pmethylphenol, p-nitrophenol is correct.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 27

Ethanol and dimethyl ether form a pair of functional isomers. The boiling point of ethanol is higher than that of dimethyl ether, due to the presence of [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 27

Due to H-bonding, the boiling point of ethanol is much higher than that of the isomeric diethyl ether.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 28

When phenol is treated with excess bromine water. It gives [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 28

With Br2 water, phenol gives 2, 4, 6-tribromophenol.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 29

Methanol is industrially prepared by [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 29

Water gas is mixed with half of its volume of hydrogen.The mixture is compressed to approximately 200 – 300 atmospheres. It is then passed over a catalyst |ZnO + Cr2O3| at 300°C. Methyl alcohol vapours are formed which are condensed

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 30

How many isomers of C5H11 OH will be primary alcohols ? [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 30

Four primary alcohols of C5H11OH are possible. These are:

(i) CH3CH2CH2CH2CH2OH

(ii)

(iii)

(iv)

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 31

When phenol is heated with CHCl3 and alcoholic KOH when salicyladehyde is produced. This reaction is known as [1988, 89]

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31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 32

Propene, CH3CH = CH2 can be converted into 1-propanol by oxidation. Indicate which set of reagents amongst the following is ideal to effect the above conversion ? [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 32

KMnO4 (alkaline) and OsO4/CH2Cl2 are used for hydroxylation of double bond while O3/Zn is used for ozonolysis. Therefore, the right option is (c), i.e.,

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 33

Which one of the following compounds will be most readily attacked by an electrophile ?[1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 33

Due to strong electron-donating effect of the OH group, the electron density in phenol is much higher than that in toluene, benzene and chlorobenzene and hence phenol is readily attacked by the electrophile.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 34

The compound which reacts fastest with Lucas reagent at room temperature is [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 34

The rates of reaction with lucas reagen t follows the order. 3° alcohol > 2° alcohol > 1° alcohol since carbocations are formed as intermediate, more stable the carbocation, higher will be the reactivity of the parent compound (alcohol). 2-Methylpropan-2-ol generates a 3º carbocation, so it will react fastest; other three generates either 1º or 2º carbocations.

2-Methyl-2-propanol

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 35

Which one is formed when sodium phenoxide is heated with ethyl iodide ? [1988]

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31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 36

Lucas reagent is [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 36

Lucas reagent is conc. HCl + anhyd. ZnCl2.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 37

HBr reacts fastest with 

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 37

Greater the stability of the intermediate carbocation, more reactive is the alcohol.
Since 2-methylpropan-2-ol generates 3° carbocation, therefore, it reacts fastest with HBr.

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 38

Reaction of     with RMgX leads toformation of 

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 38

We know that

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 39

Which of the following compounds will form hydrocarbon on reaction with Grignard reagent ?

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 39

The correct answer is option C
CH3CH2OH

31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 40

Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI? 

Detailed Solution for 31 Year NEET Previous Year Questions: Alcohols, Phenols & Ethers - Question 40

The reaction will proceed via SN1 or SN2 based on nature of alkyl group. If alkyl group attached is 3°. The reaction will proceed through the SN1 mechanism and if alkyl group is primary reaction will proceed through SN2 mechanism.

                                                  

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