Engineering Chemistry I Practice Test 1

1. Which of the following compound would show optical isomerism?

(CH₃)₂ CHCHO

H₂N CH(CH₃)₂

H₂N CH₂ COOH

CH₃ - CH(OH) COOH

2. If the rotation of the plane is clockwise, the substance is dextrorotatary.

True

False

3. According to Molecular Orbital Theory, the shape and size of a molecular orbital depends upon _________

Numbers of the combining atomic orbitals

Orientation of the combining atomic orbitals

All of the mentioned

Shape and size of the combining atomic orbitals

4. Diastereomers are _________

Mirror images

Unstable molecules

Geometrical isomers

Non-mirror images

5. The interaction between a pair of orbitals of the same type is _________

None of the mentioned

Repulsive

Attractive

There is no interaction

6. Arrange the following molecules in the order of increasing stability.

N₂⁺ < N₂ < N₂^- < N₂^2-

N₂^2- < N₂^- = N₂⁺ < N₂

N₂ < N₂⁺ = N₂^- < N₂^2-

N₂^2- < N₂^- < N₂ < N₂⁺

7. Optical activity can also result from the lack of molecular symmetry in molecules.

True

False

8. As the optical activity changes with the wavelength of light, it is necessary not to use monochromatic light to measure optical activity.

True

False

9. Which of the following is not a priority rule for R, S-Configuration?

If the two atoms attached to chiral centre are same, the atoms attached to each of these first atoms are compared

If the four atoms attached to the chiral centre are all different, priority depends on atomic number, with the atom of lower atomic numbers getting lower priority

If the four atoms attached to the chiral centre are all different, priority depends on atomic number, with the atom of higher atomic numbers getting lower priority

When there is a double bond or triple bond, both atoms are considered to be duplicated or triplicated

10. Which orbital would form a more stronger bond if both of them have identical stability?

The one which is less directionally concentrated

It differs from atom to atom

Both will be equally strong

The one which is more directionally concentrated