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

The molecule, among the following, that has the smallest heat of hydrogenation per mole is:

1. Cis-2-Butene

2. Trans-2-Butene

3. Propene

4. 1-Butene

Which of the following compounds will exhibit geometrical isomerism?

1. 1-Phenyl-2-butene

2. 3-Phenyl-1-butene

3. 2-Phenyl-1-butene

4. 1, 1-Dipheny]-1 -propene

The compounds that show geometrical isomerism among the following are:

a. 2-Butene

b. Propene

c. 1-Phenylpropene

d. 2-Methylbut-2-ene

1. a, b

2. c, d

3. a, b, c

4. a, c

How many optically active stereoisomers are possible for butane-2,3-diol?

1. 1

2. 2

3. 3

4. 4