CBSE 2025 · Region 5 · Set 1 · Q32 · 5 marks
(i)In a chemistry practical class, the teacher gave his students an amine 'X' having molecular formula $\displaystyle \mathrm{C}_{2} \mathrm{H}_{7} \mathrm{~N}$, and asked the students to identify the type of amine. One of the students, Neeta, observed that it reacts with $\displaystyle \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{SO}_{2} \mathrm{Cl}$, to give a compound which dissolves in NaOH solution. Can you help Neeta to identify the compound 'X' ?(ii)Arrange the following in the increasing order of their $\displaystyle \mathrm{pK}_{\mathrm{b}}$ value in aqueous phase : $\displaystyle \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2},\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}, \mathrm{NH}_{3}, \mathrm{CH}_{3} \mathrm{NH}_{2},\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}$(iii)Aniline on nitration gives considerable amount of meta product along with ortho and para products. Why ?(iv)Convert aniline to :(I)p-bromoaniline(II)phenol(i)Arun heated a mixture of ethylamine and $\displaystyle \mathrm{CHCl}_{3}$ with ethanolic KOH, which forms a foul smelling gas. Write the chemical equation involved.(ii)Identify A and B in the following reactions :
(iii)Convert aniline to :(I)benzene(II)sulphanilic acid
(i)
In a chemistry practical class, the teacher gave his students an amine 'X' having molecular formula $\displaystyle \mathrm{C}_{2} \mathrm{H}_{7} \mathrm{~N}$, and asked the students to identify the type of amine. One of the students, Neeta, observed that it reacts with $\displaystyle \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{SO}_{2} \mathrm{Cl}$, to give a compound which dissolves in NaOH solution. Can you help Neeta to identify the compound 'X' ?
(ii)
Arrange the following in the increasing order of their $\displaystyle \mathrm{pK}_{\mathrm{b}}$ value in aqueous phase : $\displaystyle \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2},\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}, \mathrm{NH}_{3}, \mathrm{CH}_{3} \mathrm{NH}_{2},\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}$
(iii)
Aniline on nitration gives considerable amount of meta product along with ortho and para products. Why ?
(iv)
Convert aniline to :
(I)
p-bromoaniline
(II)
phenol
(i)
Arun heated a mixture of ethylamine and $\displaystyle \mathrm{CHCl}_{3}$ with ethanolic KOH, which forms a foul smelling gas. Write the chemical equation involved.
(ii)
Identify A and B in the following reactions :
(iii)
Convert aniline to :
(I)
benzene
(II)
sulphanilic acid
Marking-scheme solution
(i)
Amine ‘X’ react with C6H5SO2Cl to give a compound ,soluble in NaOH so amine ‘X’ is
primary amine, CH3CH2NH2/Ethanamine/Ethyl amine
(ii)
(CH3)2NH <CH3NH2 < (CH3)3N < NH3 <C6H5NH2
(iii)
In the strongly acidic medium, aniline is protonated to anilinium ion, which is meta-
directing.
(iv)
(I)
(II)
(b)(i)
(ii)
A =
B =
(iii)
(I)
(II)
AminesChemical Reactions of AminesAnalyselong_answerhard
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CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.