What is the hybridization type of the \(\mathrm{C}_{4}- \mathrm{C}_5\) bond in the compound CH ₂=CH-CH₂-CH₂-C≡CH?

1. $\mathrm{sp}-{\mathrm{sp}}^2$
2. ${\mathrm{sp}}^3-{\mathrm{sp}}^{\mathrm{}}$
3. $\mathrm{sp}-{\mathrm{sp}}^3$
4. ${\mathrm{sp}}^2-{\mathrm{sp}}^3$

An organic compound ${\mathrm{C}}_4{\mathrm{H}}_8\mathrm{O}$ is found to be optically active. Which of the following is the correct structure of the given compound?

1. ${(\mathrm{CH}}_{}$₃)2CHCHO

2. ${\mathrm{CH}}_2 = \mathrm{CH} — \mathrm{CH}\left(\mathrm{OH}\right){\mathrm{CH}}_3$

3. ${\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{CH}}_3$

4. ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CHO}$

How many optical isomers are formed by the hydrogenation of the compound \((CH_3)_2C=CHCH_3\)?

1. 0
2. 1
3. 2
4. 3

What is the number and type of bonds between the two carbon atoms in CaC₂?

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

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

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

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