Old Exam Papers June 2012 (Set 2)

(iii) Fkk;ksQhu dks pØh; lYQksu esa
(iv) ikbfjMhu dks 2-,ehuksikbfjMhu esa
(v) ikbjkWy dks ikbjkWfyMhu esa
5. How will you prove that - and -positions in pyridine are
suitable for nucleophilic substitution and -for electrophilic
substitution ? 10
dSls fl) djsaxs fd fifjMhu esa - rFkk -LFkku ukfHkdLusgh
izfrLFkkiu ds fy, mfpr gS rFkk -LFkku bysDVªkuLusgh izfrLFkkiu
ds fy, mfpr gS \ 10
6. (a) Write down the synthesis of isoquinoline with
mechanism ? 5
vkblksDohuksyhu dk la'ys"k.k] fØ;kfof/k ds lkFk
fyf[k;sA 5
(b) Write down Skraup synthesis and its mechanism. 5
LØkWi la'ys"k.k rFkk mldh fØ;kfof/k fyf[k;sA 5
7. (a) How will you prepare acetone and acetic acid from
acetoacetic ester ? 5
,flVksu rFkk ,flfVd vEy dks ,flVks&,flfVd ,LVj
}kjk dSls cuk;saxs \ 5
200 4 CH-10
10
(ii) Why does C 2 H 5 SH is more acidic than C 2 H 5 OH ? 2
C 2 H 5 SH D;ksa vf/kd vEyh; gksrh gS C 2 H 5 OH ls \ 2
(iii) What are sulphonium salts ? How will you obtain
ethene from ethylmercaptan ? 3
lYQksfu;e yo.k D;k gksrs gSa \ bFkkby edsZIVku ls
bFkhu dSls izkIr djsaxs \ 3
(iv) How will you prepare sulphonamide from aniline ? 3
,fuyhu ls lYQksukekbM dSls cuk;saxs \ 3
4. How will convert the following :
(i) Furan to furylmethyl ketone
(ii) Pyrrol to Pyrrol-2-carbaldehyde
(iii) Thiophene to cyclic sulphone
(iv) Pyridine to 2-Amino pyridine
(v) Pyrrol to pyrolidene
fuEufyf[kr dks dSls ifjofrZr djsaxs %
(i) ;wjku dks ;wjkby feFkkby fdVksu esa
(ii) ikbjkWy dks ikbjkWy-2- dkcZfYMgkbM esa
CH-10 3 PTO
10