Correct answer Carries: 4.
Wrong Answer Carries: -1.
Which amine turns bromine water colorless due to substitution?
Aniline (\( \ce{C6H5NH2} \)) undergoes electrophilic substitution with \( \ce{Br2} \) in water, forming 2,4,6-tribromoaniline and decolorizing bromine, as per the PDF.
A primary amine \( X \) reacts with \( \ce{HNO2} \) to give \( \ce{CH3CH2CH2CH2OH} \). \( X \) is:
Butan-1-amine (\( \ce{CH3CH2CH2CH2NH2} \)) reacts with \( \ce{HNO2} \) to form butan-1-ol (\( \ce{CH3CH2CH2CH2OH} \)) and \( \ce{N2} \), as per the PDF.
An amine \( X \) reacts with \( \ce{CH3CH2Cl} \) to form a tertiary amine. \( X \) could be:
A secondary amine like \( \ce{CH3NHCH3} \) reacts with \( \ce{CH3CH2Cl} \) to add an ethyl group, forming a tertiary amine (\( \ce{CH3CH2N(CH3)2} \)), as per the PDF’s alkylation.
Which amine produces a yellow oily liquid on reaction with \( \ce{HNO2} \)?
Secondary amines like \( \ce{(CH3CH2)2NH} \) react with \( \ce{HNO2} \) to form yellow oily nitrosamines (e.g., \( \ce{(CH3CH2)2N-NO} \)), as described in the PDF’s chemical tests.
The number of lone pairs on nitrogen in \( \ce{(CH3)3N} \) is:
In trimethylamine (\( \ce{(CH3)3N} \)), nitrogen has three sigma bonds to carbon and one lone pair, as per the PDF’s structure section.
The number of lone pairs on nitrogen in \( \ce{CH3CH2NHCH3} \) is:
In \( \ce{CH3CH2NHCH3} \), nitrogen has three sigma bonds (two C, one H) and one lone pair, as per the PDF’s structure.
The product of \( \ce{CH3CH2NH2} \) with \( \ce{CH3CH2CH2COCl} \) is:
Ethylamine (\( \ce{CH3CH2NH2} \)) reacts with butanoyl chloride (\( \ce{CH3CH2CH2COCl} \)) to form N-ethylbutanamide (\( \ce{CH3CH2CH2CONHCH2CH3} \)), as per the PDF’s acylation.
An amine \( X \) reacts with \( \ce{CHCl3} \) and KOH to form \( \ce{CH3CH2NC} \). \( X \) is:
Ethylamine (\( \ce{CH3CH2NH2} \)) forms ethyl isocyanide (\( \ce{CH3CH2NC} \)) in the carbylamine reaction, as per the PDF’s chemical properties.
The basic strength of aniline is less than aliphatic amines due to:
Resonance in aniline delocalizes the nitrogen lone pair into the benzene ring, reducing basicity compared to aliphatic amines, as per the PDF.
Which amine does not react with benzenesulphonyl chloride?
Tertiary amines like \( \ce{(CH3CH2)3N} \) lack a hydrogen on nitrogen to form sulphonamides with benzenesulphonyl chloride, unlike primary and secondary amines.
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