Organic Chemistry (part-2).

Q: Which of the following compounds exhibit rotamers ?

O: (a) 2-butene. (b) Maleic acid.

(c) Butane. (d) Fumeric acid.

A: (c) Butane.

Q: How many numbers of possible stereoisomers are there of 2,3,4-trichloro pentanoic acid?

O: (a) 8 (b) 12

(c) 16 (d) 4

A: (a) 8

Q: The number of opically active isomers of tatraic acid are

O: (a) 1 (b) 3

(c) 4 (d) 2

A: (c) 3

Q: How many enantiomer pairs are obtained by monochlorination of 2,3-dimetylbutane?

O: (a) Zero. (b) Four.

(c) Tow. (d) Three.

(e) One.

A: (c) Two.

Q: The total number of acyclic structural and optical isomers possible for a hydrocarbon of molecular

O: (a) 12 (b) 8

(c) 10 (d) 6

A: (b) 8

Q: The total number of possible isomeric trimethyl benzene is

O: (a) 2 (b) 3

(c) 4 (d) 6

A: (b) 3

Q: A chemical compound is heated and dried. To get accurate weight of this compound, one shuld

O: (a) Cool in dessicator.

(b) Weigh in warm conditions.

(c) Weigh after cooling.

(d) Blow air through it.

A: (a) Cool in dessicator.

Q: An organic compound weighing 0.31g gave 0.444g of magnesium pyrophosphate in the estimation of phosphorus by Carius method.The percentage of P in the compound is

O: (a) 20 (b) 60

(c) 15 (d) 30

(e) 40

A: (e) 40

Q: Which of the following compounds gives blood red colouration when its Lassaigne’s extract is treated with alkali and ferric chloride?

O: (a) Thiourea. (b) Diphenyl sulphide.

(c) Phenyl hydrazine. (d) Benzamide.

A: (a) Thiourea.

Q: Dehydration of alcohol is an example of which type of reaction?

O: (a) Substitution. (b) Elimination.

(c) Addition. (d) Rearrangement.

A: (b) Elimination.

1 2 3 4 5 6 7 8 9 10