Structural isomerism and stereoisomerism — practice questions

Question 1 · difficulty L2 · understanding

The number of different chain isomers for C$$_7$$H$$_{16}$$ is __________.

Question 2 · difficulty L2 · understanding

Number of optical isomers possible for 2-chlorobutane ________.

Question 3 · difficulty L2 · understanding

Optical activity of an enantiomeric mixture is $$+12.6^{\circ}$$ and the specific rotation of $$(+)$$ isomer is $$+30^{\circ}$$. The optical purity is __________$$\%$$.

Question 4 · difficulty L2 · understanding

Observe structures of the following compounds The total number of structures/compounds which possess asymmetric carbon atoms is ______________.

Question 5 · difficulty L2 · understanding

The dihedral angle in staggered form of Newman projection of 1, 1, 1-Trichloro ethane is ___________ degree. (Round off to the nearest integer)

Question 6 · difficulty L2 · understanding

$$\text { The following structures are }$$

• A. enantiomers.
• B. identical molecules.
• C. diastereomers.
• D. meso compounds.

Question 7 · difficulty L2 · understanding

Match List - I with List - II. List - I Pair of Compounds List - II Type of Isomers A. 2-Methylpropene and but-1-ene I. Stereoisomers B. Cis-but-2-ene and trans-but-2-ene II. Position isomers C. 2-Butanol and diethyl ether III. Chain isomers D. But-1-ene and but-2-ene IV. Functional group isomers Choose the correct answer from the options given below :

• A. A-III, B-I, C-IV, D-II
• B. A-II, B-I, C-IV, D-III
• C. A-I, B-IV, C-III, D-II
• D. A-III, B-I, C-II, D-IV

Question 8 · difficulty L2 · understanding

Identify correct statements from the following : A. Propanal and propanone are functional isomers. B. Ethoxyethane and methoxypropane are metamers. C. But-2-ene shows optical isomerism. D. But-1-ene and but-2-ene are functional isomers. E. Pentane and 2, 2-dimethyl propane are chain isomers. Choose the correct answer from the options given below :

• A. A, B and E only
• B. A, B and C only
• C. C, D and E only
• D. B, C and D only

Question 9 · difficulty L2 · understanding

Given below are two statements: Statement I : and are isomeric compounds. Statement II : and are functional group isomers. In the light of the above statements, choose the correct answer from the options given below:

• A. Statement I is false but Statement II is true
• B. Both Statement I and Statement II are true
• C. Statement I is true but Statement II is false
• D. Both Statement I and Statement II are false

Question 10 · difficulty L2 · understanding

How many different stereoisomers are possible for the given molecule?

• A. 2
• B. 1
• C. 3
• D. 4