Chemistry Test 182

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Chemistry Test 182

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following structures are superimposable (identical) :

A
I and II

B
II and III

C
I and IV

D
I and III

Solution

Both in (I) & (III) configuration at lower chiral carbon is 'R' and upper chiral carbon is 'S'.
Question 2
4 / -1

If optical rotation is produced by is + 36^o then that is produced by

A
–36º

B
0º

C
+36º

D
unpredictable

Solution

Rotation of the compound in question is zero because it is a meso compound.
Question 3
4 / -1

The major product (ester) of the following reaction is

A
A single stereoisomer (optically active)

B
A mixture of diastereomers (both optically active)

C
A racemic mixture (optically inactive)

D
A mixture of four stereoisomers (two racemic mixtures)

Solution
Question 4
4 / -1

The most stable conformation of 3-fluorobutan-2-ol is :

A
Fully eclipsed form

B
Partially eclipsed form

C
Gauche form

D
Anti form

Solution

(Stable due to intramolecular H bonding)
Question 5
4 / -1

Arrange in decreasing order of e-density in Benzene ring-

A
F > E > H > G

B
E > H > G > F

C
H > F > E > G

D
G > F > H > E

Solution

Electron donating ability of group order :

-NH₂ > -N(CH₃)₂ > - NH - CHO > -NH₂
Question 6
4 / -1

A Natural Drug was having [a] = 40.3º in polarimeter experiment in clockwise direction what can be the structure of this drug.

A

B

C

D

Solution

is optically active compound so it rotate the plane of ppl.
Question 7
4 / -1

Acetaldehyde and acetylene can not be distinguished by :

A
Tollen’s reagent

B
Fehling solution

C
Lucas reagent

D
Iodoform test

Solution

Lucas reagent can not be used to distinguished Acetaldehyde and acetylene.
Question 8
4 / -1

Which is the most stable resonating structure.

A

B

C

D

Solution

Negative charge on more electronegative atom is more stable.
Question 9
4 / -1

In which delocalisation of positive charge is possible

A

B

C

D

Solution

In all other cases positive charge is not in conjugation.
Question 10
4 / -1

Which of the following pairs of structures do not represent resonating structures ?

A

B

C

D

Solution

Structures given in option(A) are tautomers.