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Alcohol, Phenol and Ether Test - 18

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Alcohol, Phenol and Ether Test - 18
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Ketones are reduced to the corresponding alcohols by catalytic hydrogenation to form

    Solution

    Ketones are reduced to secondary alcohols.

  • Question 2
    1 / -0

    Which of the following reagents can be used to oxidise primary alcohols to aldehydes?

    Solution

    All of these are mild oxidizing agent which can oxidize alcohols to aldehyde and ketone.

  • Question 3
    1 / -0

    Ketones react with Grignard reagent to produce

    Solution

  • Question 4
    1 / -0

    In the reaction

    Solution

    Phenols are acidic in nature so they react with bases to form phenoxide ion.

  • Question 5
    1 / -0

    What is the correct order of reactivity of alcohols in the following reaction?

    Solution

    Because 3o carbocation is most stable.

  • Question 6
    1 / -0

    Phenol can be distinguished from ethanol by the reactions with _________.

    Solution

    (a), (c)

    (a) Br2/water

    (c) Neutral FeCl3

  • Question 7
    1 / -0

    Primary alcohols are prepared by reduction of carboxylic acids. Though lithium aluminium hydride is a strong reducing agent, it is not used in the reaction. Because 

    Solution

    LiAlH4 is quite expensive.

  • Question 8
    1 / -0

    The reaction  C2H5ONa + C2H5I → C2H5OCH5 + NaI   is known as

    Solution

    Rxn of sodium ethoxide with alkyl halide is known as Williamsons synthesis.

  • Question 9
    1 / -0

    How many alcohols with molecular formula C4H10O are chiral in nature?

    Solution

    Here, again carbon is not chiral in nature.
    So, only one alcohol is chiral in nature

  • Question 10
    1 / -0

    Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method.

    Solution

    Foe the given conditions elimination domintes over substitution. And alkenes are formed.

  • Question 11
    1 / -0

    Aldehydes are reduced to the corresponding alcohols by addition of hydrogen in the presence of catalysts to form

    Solution

  • Question 12
    1 / -0

    Alcohols have high boiling points because of

    Solution

    Alcohols have strong H bonding.

  • Question 13
    1 / -0

    Lucas test is associated with

    Solution

    Lucas test is distinguishing test for alcohols.

  • Question 14
    1 / -0

    An organic compound containing oxygen, upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound is ______.

    Solution

    When –CH2OH group is replaced by –COOH group then only molecular wt will increase by 14units.

  • Question 15
    1 / -0

    The process of converting alkyl halides into alcohols involves_____________.

    Solution

    Converstion of alcohol to alkyl halide is via substitution reaction.

  • Question 16
    1 / -0

    Which of the following compounds will react with sodium hydroxide solution in water?

    Solution

    The correct answer is Option A.
    Phenol (C6H5OH) will react with sodium hydroxide solution in water , as phenols are more acidic than alcohols.

  • Question 17
    1 / -0

    The reaction which involves dichlorocarbene as an electrophile is

    Solution

    The correct answer is Option A.

    Reimer Tiemann reaction which converts phenol to ortho- hydroxybenzaldehyde involves the formation of dichlorocarbene which acts as an electrophile and attacks on the ortho position of phenol.

  • Question 18
    1 / -0

    An organic compound X is oxidised by using acidified K2Cr2O7. The product obtained reacts with Phenyl hydrazine but does not answer silver mirror test. The possible structure of X is

    Solution

    Since the product of oxidation reacts with phenyl hydrazine, it is a carbonyl compound. Since it does not answer silver mirror test, it must be a ketone. Ketones are produced by the oxidation of secondary alcohols. So the compound X is isopropyl alcohol

  • Question 19
    1 / -0

    Methyl bromide is converted into ethane by heating it in ether medium with

    Solution

    Wurtz reaction.

  • Question 20
    1 / -0

    One of the following alcohol is a poison and Ingestion of even small quantities can cause blindness and large quantities causes even death.

    Solution

    Methanol is apoison and ingestion of even trace quantity can be fatal.

  • Question 21
    1 / -0

    The starting material for picric acid is,

    Solution

    Pictric acid is trinitroderivative of phenol.

  • Question 22
    1 / -0

    Give IUPAC name of the compound given below.

    Solution

    The correct answer is Option C.
    Given molecule:

    For IUPAC nomenclature following steps are followed:
    1. Identify the functional group and their priority: -OH and -Cl are the side groups in the given molecule. OH has higher priority thus the name will have the suffix "ol".
    2. Identify parent chain: The longest carbon chain that contains the functional group. Here its 6 C chain i.e hexyl
    3. Assign locant number: lowest number to the main functional group and side chains i.e. 2-ol 
    4. Identify side chains/groups: its chloro, and 5-chloro in the given molecule.

    IUPAC name is: 5-chlorohexan-2-ol
     

  • Question 23
    1 / -0

    Phenol is less acidic than ______________.

    Solution

    Phenol is less acidic than O−nitrophenol. Nitro group is an electron-withdrawing group. It decreases electron density on benzene ring and delocalizes negative charge of phenoxide ion. It increases acidity. Hence, O−nitrophenol is more acidic than phenol. 

     

    On the other hand, methoxy group is an electron releasing group. It increases electron density on benzene ring and does not delocalizes negative charge of phenoxide ion. It decreases acidity. Hence,  p−methoxyphenol is less acidic than phenol. Also, alcohols (2− methylpropanol and 2,2− dimethyl pentanol) are neutral.

  • Question 24
    1 / -0

    A hydrocarbon C5H10 does not react with chlorine in dark but gives a single monochloro compound C5H9Cl in bright sunlight. The hydrocarbon is

    Solution

    Since monochlorinated compound is formed so that menas all the hydrogens are same.

  • Question 25
    1 / -0

    Which of the following species can act as the strongest base?

    Solution

    RO- has more electron density.

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