92.

33.

34.

35.

36.

37.

38.

39.

11950 in a toxicity test stands for
(A) 8 dose that will kill 50% of an exposed population
(3) 8 १०६९ that would not affect or harm 50% of an exposed population
(C) a dose that will kill 25% of an exposed population
(D) a dose that would not kill 25% of an exposed population

Which of the following is not soluble in NaHCO;?
(^) 2, 4, 6-Trinitrophenol ൯) Benzoic acid
(0 o-Nitrophenol (D) Benzene sulphonic acid

The product formed by the reaction of an aldehyde with a primary amine 18 :
(^) Carboxylic acid (B) Aromatic acid
(C) Ketone (7) Schiff's base

Which of the following is most reactive towards Sn1 reaction?
(^) C.H;C(CH;)C;H;Br ‏رم‎ C,H;CH,Br
(C) C,H,CH(C,H;)Br ന C,H;CH(CH;)Br

A dihalogen derivative ‘X’ of a hydrocarbon with three carbon atoms react with ale. KOH and
produces hydrocarbon which forms red ppt. with ammoniacal റം. ‘X’ gives an aldehyde on
reaction with aq. KOH. The compound 26 is

(A) 1, 3-Dichloropropane ൯) 1, 2-Dichloropropane

(C) 2, 2-Dichloropropane ൯൩) 1, 1-Dichloropropane

The synthesis of alkyl fluoride is best accomplished by :
(^) Finkelstein reaction (B) Swartz reaction
(C) Free radical fluorination (D) Sandmeyer’s reaction

Which of the following compounds will give racemic mixture on nucleophilic substitution by
OH” ion?

1 -Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene
(A) Bromobenzene > 1-Bromobutane > 1-Bromopropane ಇ 1-Bromoethane
൯) Bromobenzene > 1-Bromoethane > 1-Bromopropane > 1-Bromobutane
(0 1-Bromopropane < 1-Bromobutane > 1-Bromoethane > Bromobenzene
0) 1-Bromoethane > 1-Bromopropane > 1-Bromobutane > Bromobenzene

Which of the following has ester linkages?
(^) Nylon ൯) Bakelite
(0) Terylene (D) PVC

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