An important chemical method to resolve aracemic mixture makes use of the formation of

a meso compound
enantiomers
diasteromers
racemates

Solution

Diastereomers since they have different melting points,boiling points, solubilities etc.

Which of the following is an optically active compound ?

1-Butanol
1-Propanol
2-Chlorobutane
4-Hydroxyheptane

Solution

The compound containing a chiral carbon atom i.e., (a carbon atom which is attached to four different atoms is known as a chiral carbon atom) is optically active.As 2-chlorobutane contains a chiral C* atom hence it is optically active.

The Beilste in test for organic compounds is used to detect

nitrogen
sulphur
carbon
halogens

The correct name for the following hydrocarbon is

Tricyclo[4.1.0] heptane
Bicyclo [5.2.1]heptane
Bicyclo [4.1.0] heptane
Bicyclo [4.1.0] hextane

Solution

Bicyclo [4, 1, 0] heptane

Correct configuration of the following is

1S, 2S
1S, 2R
1R, 2R
1R, 2S

Which of the following compounds contains 1°, 2°, 3° as well as 4° carbon atoms ?

Neopentane
2-methyl pentane
2,3-dimethyl butane
2,2,3-trimethyl pentane

Solution

2,2,3-trimethyl pentane

Among the following the most stable compound is:

cis-1, 2-cyclohexanediol
trans-1, 2-cyclohexanediol
cis-1,3-cyclohexanediol
trans-1, 3-cyclohexanediol

Solution

Among 1, 2- and 1, 3- configurations, 1, 3- is more stable due to less repulsion.Further among cis and trans isomers, trans is mores table due to less crowding.

The IUPAC name for

5–chlorohex–2–ene
2–chlorohex–5–ene
1–chloro–1–methylpent–3–ene
5–chloro–5–methylpent–2–ene

Solution

The IUPAC name of the given compound is 5-chlorohex-2-ene.

The geometrical isomerism is shown by

Solution

Geometrical isomerism is obseved when different groups are attached to each of the doubly bonded carbon atom.

The number of secondary hydrogens in 2, 2-dimethylbutane is :

8
6
4
2

Solution

Thus number of secondary hydrogens is two.

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