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Alcohols, Phenols and Ethers · Question 25

AIPMT 2015MCQMedium📈 Topic in 38% papers+4−1
1

Which of the following is not the product of dehydration of [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(1) [figure]

Solution

The given alcohol, 2-cyclohexylbutan-2-ol, has 10 carbon atoms. Dehydration removes only H2O, so every product must also have 10 carbon atoms.

On heating with acid, a 3° carbocation is formed:

[figure]

Loss of a β-hydrogen from the ring CH, the CH2 group or the CH3 group gives the alkenes in options (3), (2) and (4) respectively (each with 10 carbon atoms).

∵ The compound in option (1) carries two methyl groups on the side-chain carbon, it has 11 carbon atoms.

∴ It cannot be formed by dehydration of the given alcohol.

Answer: (1)

AIPMT 2015

Keep practising — Alcohols, Phenols and Ethers

2

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group?

  1. -COOH
  2. -CHCl2
  3. -CHO
  4. -CH2Cl
AIPMT 2015
3

The reaction, [figure] is called

  1. Etard reaction
  2. Gattermann-Koch reaction
  3. Williamson synthesis
  4. Williamson continuous etherification process
AIPMT 2015 (Cancelled)
4

Identify Z in the sequence of reactions: CH3CH2CH=CH2 HBr/H2O2 Y C2H5ONa Z

  1. CH3-(CH2)3-O-CH2CH3
  2. (CH3)2CH-O-CH2CH3
  3. CH3(CH2)4-O-CH3
  4. CH3CH2-CH(CH3)-O-CH2CH3
AIPMT 2014
5

Among the following sets of reactants which one produces anisole?

  1. CH3CHO ; RMgX
  2. C6H5OH ; NaOH ; CH3I
  3. C6H5OH ; neutral FeCl3
  4. C6H5CH3 ; CH3COCl ; AlCl3
AIPMT 2014
6

Which of the following will not be soluble in sodium hydrogen carbonate?

  1. 2,4,6-Trinitrophenol
  2. Benzoic acid
  3. o-Nitrophenol
  4. Benzenesulphonic acid
AIPMT 2014
7

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET 2013
8

Which of the following compounds can be used as antifreeze in automobile radiators?

  1. Methyl alcohol
  2. Glycol
  3. Nitrophenol
  4. Ethyl alcohol
AIPMT 2012 (Mains)
9

In the following reaction [figure] The major product is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2012 (Prelims)
10

Match the compounds given in List-I with List-II and select the suitable option using the code given below.

  1. (A)-(iv), (B)-(i), (C)-(iii), (D)-(ii)
  2. (A)-(iv), (B)-(ii), (C)-(iii), (D)-(i)
  3. (A)-(ii), (B)-(iii), (C)-(iv), (D)-(i)
  4. (A)-(ii), (B)-(i), (C)-(iv), (D)-(iii)
AIPMT 2011 (Mains)
11

In the following reactions, (i) CH3- CH3 |CH- OH |CH-CH3 H+/heat (Major product)A + (Minor product)B (ii) A [in absence of peroxide]HBr, dark (Major product)C + (Minor product)D the major products (A) and (C) are respectively

  1. CH2= CH3 |C-CH2-CH3 and Br |CH2- CH3 |CH-CH2-CH3
  2. CH3- CH3 |C=CH-CH3 and CH3- Br | CH3 |C-CH2-CH3
  3. CH2= CH3 |C-CH2-CH3 and CH3- Br | CH3 |C-CH2-CH3
  4. CH3- CH3 |C=CH-CH3 and CH3- CH3 |CH- Br |CH-CH3
AIPMT 2011 (Prelims)

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