The number of optical isomers formed by hydrogenation of the compound, ${(\mathrm{CH}}_{}$₃)2C=CHCH3 are

1. 0

2. 1

3. 2

4. 3

The number and type of bonds between two carbon atoms in ${\mathrm{CaC}}_2$ are

1. One sigma and one $\mathrm{\pi }$ bond

2. One sigma and two $\mathrm{\pi }$ bond

3. One sigma and one and a half $\mathrm{\pi }$ bonds

4. One sigma bond

Which of the following has the least hindered rotation about carbon-carbon bond?

1. Ethane

2. Ethylene

3. Acetylene

4. Hexachloroethane

The Cl — C — Cl angles in 1,1,2,2-tetrachloroethene and tetrachloromethane will be about :

1. $120°$ $\mathrm{and}$ $109.5°$

2. $90°$ $\mathrm{and}$ $109.5°$

3. $109.5°$ $\mathrm{and}$ $90°$

4. $109.5°$ $\mathrm{and}$ $120°$

Ibuprofen has the following structure:

This compound shows:
1. Geometrical isomerism

2. Optical isomerism

3. Tautomerism

4. Both 1 and 2

The enolic form of an acetone contains:

1. 9 sigma bonds, 1 pi bond, and 2 lone pairs of electrons

2. 8 sigma bonds, 2 pi bonds, and 2 lone pairs of electrons

3. 10 sigma bonds, 1 pi bond, and 1 lone pair of electrons

4. 9 sigma bonds, 2 pi bonds, and 1 lone pair of electrons

How many chiral carbon atoms are present in 2,3,4-trichloropentane?

1. Three

2. Two

3. One

4. Four

The IUPAC name of ${\mathrm{CH}}_3-\underset{{\mathrm{CH}}_2-{\mathrm{CH}}_3}{\underset{|}{\mathrm{CH}}}-\mathrm{CHO}$  is

1. Butan-2-aldehyde

2. 2- methylbutanal

3. 3- Methylisobutyraldehyde

4. 3- methylbutanal

An optically active compound is

1. 1-bromobutane

2. $\mathrm{\beta }$-bromobutyric acid

3. 2-Bromo-2-methyl propane

4. 1-Bromo-2-methyl propane

Which of the following compounds exhibit stereoisomerism?

1. 2-methylbut-1-ene

2. 3-methylbut-1-ene

3. 3-methylbutanoic acid

4. 2-methylbutanoic acid