Practice free Amines (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
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.'
Which of the following derivatives of ammonia contains a secondary amino group and is used to increase blood pressure?
The context states: 'Two biologically active compounds, namely adrenaline and ephedrine, both containing secondary amino group, are used to increase blood pressure.' Novocain is an anesthetic, Benadryl is an antihistaminic with a tertiary amino group, and quaternary ammonium salts are surfactants.
The geometry of amines is pyramidal, and the hybridization of the nitrogen atom in amines is:
The NCERT text explicitly mentions: 'Like ammonia, nitrogen atom of amines is trivalent and carries an unshared pair of electrons. Nitrogen orbitals in amines are therefore, $sp^3$ hybridised and the geometry of amines is pyramidal.'
Which of the following statements is INCORRECT regarding amines?
The context states: 'On the other hand, aromatic amines are weaker bases than ammonia due to the electron withdrawing nature of the aryl group.' The other options are correctly stated in the provided text.
Arrange the following amines in decreasing order of their boiling points, assuming similar molar masses: Primary amine, Tertiary amine, Secondary amine.
The text states: 'Therefore, the order of boiling points of isomeric amines is as follows: Primary > Secondary > Tertiary.' This is due to the extent of intermolecular hydrogen bonding, being highest in primary amines and absent in tertiary amines.
Why do primary amines have a higher boiling point than tertiary amines of comparable molar masses?
The text explains: 'This intermolecular association is more in primary amines than in secondary amines as there are two hydrogen atoms available for hydrogen bond formation in it. Tertiary amines do not have intermolecular association due to the absence of hydrogen atom available for hydrogen bond formation.'
Which method is preferred for the reduction of nitro compounds to amines, especially considering the regeneration of HCl?
The context mentions: 'Reduction with iron scrap and hydrochloric acid is preferred because $FeCl_2$ formed gets hydrolysed to release hydrochloric acid during the reaction. Thus, only a small amount of hydrochloric acid is required to initiate the reaction.'
The ammonolysis of alkyl halides has a disadvantage. What is it?
The NCERT text states: 'Ammonolysis has the disadvantage of yielding a mixture of primary, secondary and tertiary amines and also a quaternary ammonium salt.'
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