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The conversion of primary aromatic amines into diazonium salts is known as:
The NCERT text defines this process: 'The conversion of primary aromatic amines into diazonium salts is known as diazotisation'.
Why is nitrous acid produced in situ during the preparation of benzenediazonium chloride?
The NCERT text states, 'Due to its instability, the diazonium salt is not generally stored and is used immediately after its preparation.' This inherent instability makes it impractical to store nitrous acid, hence it's generated in situ from $ ext{NaNO}_2$ and $ ext{HCl}$.
Which statement about benzenediazonium chloride is correct?
The NCERT text describes it as a 'colourless crystalline solid. It is readily soluble in water and is stable in cold but reacts with water when warmed.'
Benzenediazonium fluoroborate is characterized by which of the following properties?
The NCERT text states, 'Benzenediazonium fluoroborate is water insoluble and stable at room temperature.'
In the Sandmeyer reaction, which of the following groups can be introduced into the benzene ring?
The NCERT text explains, 'The $ ext{Cl}^-$, $ ext{Br}^-$ and $ ext{CN}^-$ nucleophiles can easily be introduced in the benzene ring in the presence of $ ext{Cu}( ext{I})$ ion. This reaction is called Sandmeyer reaction.'
What is the key difference between the Sandmeyer reaction and the Gatterman reaction for introducing chlorine/bromine?
The NCERT text states, 'The $ ext{Cl}^-$, $ ext{Br}^-$ and $ ext{CN}^-$ nucleophiles can easily be introduced in the benzene ring in the presence of $ ext{Cu}( ext{I})$ ion. This reaction is called Sandmeyer reaction. Alternatively, chlorine or bromine can also be introduced in the benzene ring by treating the diazonium salt solution with corresponding halogen acid in the presence of copper powder. This is referred as Gatterman reaction.'
Which statement accurately compares the yield of Sandmeyer and Gatterman reactions?
The NCERT text explicitly mentions, 'The yield in Sandmeyer reaction is found to be better than Gattermann reaction.'
How is iodobenzene typically prepared from a diazonium salt?
The NCERT text states, 'Iodine is not easily introduced into the benzene ring directly, but, when the diazonium salt solution is treated with potassium iodide, iodobenzene is formed.'
Aryl fluorides are prepared by heating arenediazonium fluoroborate. This reaction is often associated with which named reaction?
The NCERT text describes the process: 'When arenediazonium chloride is treated with fluoroboric acid, arene diazonium fluoroborate is precipitated which on heating decomposes to yield aryl fluoride.' Although not explicitly named in the provided excerpt as 'Balz-Schiemann', this is the widely recognized name for this specific preparation method of aryl fluorides from diazonium salts, making it a suitable inference for NEET-level general knowledge.
What happens when the temperature of a diazonium salt solution is allowed to rise up to 283 K?
The NCERT text states, 'If the temperature of the diazonium salt solution is allowed to rise upto 283 K, the salt gets hydrolysed to phenol.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.