Kerala PSC Previous Years Question Paper & Answer

Title : SCIENTIFIC OFFICER (CHEMISTRY) -KERALA POLICE SERVICE (FORENSIC SCIENCE LABORATORY)
Question Code : A

Page:7


Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'SCIENTIFIC OFFICER (CHEMISTRY) -KERALA POLICE SERVICE (FORENSIC SCIENCE LABORATORY) ' And exam conducted in the year 2021. And Question paper code was '020/2021'. Medium of question paper was in Malayalam or English . Booklet Alphacode was 'A'. Answer keys are given at the bottom, but we suggest you to try answering the questions yourself and compare the key along wih to check your performance. Because we would like you to do and practice by yourself.

page: 7 out of 16
Excerpt of Question Code: 020/2021

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Which of the disconnection (I-IV) is best likely to occur for the following structure ?

ടൂ
B 7 7. ॥.॥ ew
H हि
86 H
(A) Disconnection I (B) Disconnection 11
(C) Disconnection 111 (D) Disconnection IV

To carry out a retrosynthetic analysis of paracetamol, pick out a reagent (A-D) which is
least likely to be useful.

Paracetamol

cl 0 1 NH,
७) जा ಅ Yr ൭ [or ©) ‏2ا‎
‎0 0 0 HO’ 110

Which one of the option containing dienes can undergo Diels-Alder reaction ?

۶1+

0 (ii) (i) (५)
(A) Only (i & iii) (8) Only (ii & iv)
(C) Only (iii & iv) (D) Only (ii, iii & iv)

Identify a correct product for the following reaction :

(i) n-BuLi, -78 deg.C
Warm to 0 deg C
(ii) H*
4१) J?
H ۶۰ (B) H H (C) 4 7 (D) பு ‏ھ7‎

How many nodes exist in LUMO (Lowest Unoccupied Molecular Orbital) of 1, 3, 5-hexatriene ?
(A) 2 (B) 3 त) 4 (>) 5

Why does the body need sunlight to make provitamin D2 ?
(A) ण the conversion of ergosterol to provitamin D2 through sigmatropic rearrangement
(B) For the conversion of cholesterol to provitamin D2 through electrocyclic reaction
(C) For the conversion of ergosterol to provitamin D2 through electrocyclic reaction
(D) For the conversion of cholesterol to provitamin D2 through cycloaddition reaction.

Match the items of List I (Alkaloid) with List II (Skeleton of their structure) :

List I List IT
(1) [Nicotine (m) |Quinoline
(ii) _[Papaverine (n)_|Isoquinoline
(iii) [Resperine (0) _|Pyrrolidine
(iv) |Quinine (0) |Indole
(A) 1-0; 1-0; सीना; एन (8)
(6) 1-0 1-1; iii-p; iv-o (2)
⊔↙⊔↙ 7 7 020/2021

[P.T.O.]

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