Practice free Alcohol, phenol & ether (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
An organic compound X is oxidised by using acidified $ K_2Cr_2O_7$ . The product obtained reacts with phenyl hydrazine but does not give silver mir or test. The possible structure of X is
$ (CH_3 )_3 CMgCl on reaction with D_2O $ produces
The reaction of $ (CH_3 )_3CMgCl $ with $ D_2O $ results in the replacement of the MgCl group with a deuterium atom (D). Therefore, the product will be $ (CH_3)_3CD $. This is because the Grignard reagent $ (CH_3 )_3CMgCl $ will react with $ D_2O $ to form $ (CH_3)_3CD $ and Mg(OD)Cl.
Lucas test is as ociated with
The Lucas test is used to differentiate between primary, secondary, and tertiary alcohols. It involves the reaction of the alcohol with Lucas reagent (a mixture of concentrated HCl and anhydrous ZnCl_2). The test is based on the reactivity of different alcohols with the Lucas reagent, where tertiary alcohols react immediately, secondary alcohols take a few minutes, and primary alcohols do not react at room temperature.
__________alcohol reacts immediately with anhydrous $ ZnCl_2 + HCl $ and gives insoluble chloride
2-Methylpropan-2-ol (a tertiary alcohol) reacts immediately with anhydrous $ ZnCl_2 + HCl $ in the Lucas test and forms an insoluble chloride. This is because tertiary alcohols form stable carbocations quickly, leading to the formation of the insoluble chloride product.
Glycerol is more viscous than ethanol due to
Glycerol is more viscous than ethanol because it forms many hydrogen bonds per molecule. Glycerol has three hydroxyl (OH) groups, each capable of forming hydrogen bonds, creating a more interconnected and cohesive liquid structure compared to ethanol, which has only one hydroxyl group.
4.6 gram ethanol when reacts with sodium metal________ is formed.
When 4.6 grams of ethanol reacts with sodium metal, 1.12 liters of hydrogen gas ($H_2$) is formed at STP. The balanced chemical equation for this reaction is: $$ 2C_2H_5OH + 2Na ightarrow 2C_2H_5ONa + H_2 ext{(gas)} $$ For every 46 grams (1 mole) of ethanol, 1 mole (22.4 liters at STP) of hydrogen gas is produced. Therefore, for 4.6 grams of ethanol, 0.1 mole of hydrogen gas is produced, which corresponds to 1.12 liters at STP.
In the Lucas test of alcohols, ap earnce of cloudines is due to the formation of
In the Lucas test, alcohols react with hydrogen chloride in the presence of zinc chloride to form alkyl chlorides. The cloudiness observed is due to the formation of the insoluble alkyl chloride. This test is particularly useful for distinguishing between primary, secondary, and tertiary alcohols based on the time it takes for the cloudiness to appear.
Salicyladehyde and o-nitrophenol are les soluble in water because,
Salicylaldehyde and o-nitrophenol are less soluble in water due to the presence of intra-molecular hydrogen bonding. Intra-molecular hydrogen bonding occurs when a hydrogen atom is shared within the same molecule, reducing the molecule's ability to form hydrogen bonds with water molecules. This leads to decreased solubility in water.
An organic compound X' With molecular formula, $ C_7H_8O is insoluble in aqueous NaHCO_3 but dissolves in NaOH . When treated with bromine water, `X' rapidly gives `Y' (C_7H_5OBr_3 )$ . The compounds X' and `Y' respectively, are
Willamson's Synthesis is used for the preparation of
Williamson's synthesis is a well-known method for the preparation of ethers. It involves the reaction of an alkoxide ion with a primary alkyl halide or tosylate in an SN2 reaction mechanism. This method is widely used in organic chemistry to form symmetrical and asymmetrical ethers.
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