General Organic Chemistry Test

Result

General Organic Chemistry Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Addition of bromine to trans-but-2-ene is

A
anti-addition

B
both

C
syn-addition

D
none

Solution

A cyclic bromonium ion is formed as an intermediate which is attacked from the opposite side to give anti addition product.
Question 2
1 / -0

Statement-1: The rate enhancement by neighbouring group participation is called anchimeric assistance.

Statement-2: The neighbouring group acting as nucleophile is present in the same molecule.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Given both statements are correct but statement II is not exact reason for statement I.
Question 3
1 / -0

trans-2-Pentene + Br₂ → Enantiomeric pair (I + II)

cis-2-Pentene + Br₂ → Enantiomeric pair (III + IV)

What is the relation between the constituents of the two enantiomeric pairs?

A
They represent four diastereomeric pairs

B
All the four compounds are identical

C
They represent two diastereomeric pairs

D
They represent three diastereomeric pairs

Solution

I and III, I and IV, II and III, II and IV are diastereomeric pairs.
Question 4
1 / -0

Statement-1: α-Dehydrohalogenation of alkyl halides is anti elimination in which bond breaking and bond forming occur simultaneously.

Statement-2: α-Dehydrohalogenation of alkyl halides gives Saytzeff product.

A
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

B
Statement-1 is false but Statement-2 is true.

C
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

D
Statement-1 is true but Statement-2 is false.

Solution

According to Saytzeff's rule, in dehydrohalogenation reactions, the preferred product is the alkene that has the greater number of alkyl groups attached to the doubly bonded carbon atoms.
Question 5
1 / -0

Statement-1: 2-Butyne when reduced with Na/NH₃ gives trans-2-butene.

Statement-2: 2-Butene has cis- and trans-isomers.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Given both statements are correct but statement II is not exact reason for statement I.