Some Basic Principles and Techniques

Some Basic Principles and Techniques
Class:XI / Unit:12

1. Which element is estimated by Carius method

Carbon
Halogen
Hydrogen
Nitrogen

2. If there is no rotation of plane polarized light by a compound in a specific solvent, thought to be chiral, it may mean that

The compound may be a racemic mixture
The compound is certainly a chiral
There is no compound in the solvent.
The compound is certainly meso

3. Which one of the following conformations of cyclohexane is chiral?

Twist boat
Rigid
Chair
Boat

4. In the Dumas method, the nitrogen present in organic compound gets converted to

Sodium Cyanide
Gaseoue Ammonia
Ammonium Sulphate.
Dinitrogen Gas

5. Insulin contains 3.4% sulphur. The minimum molecular weight of insulin is

350
470
940
530

6. An organic compound which produces a bluish green coloured flame on heating in presence of copper is

Benzoic acid
Benzoic acid
Chlorobenzene
Aniline

7. Which of the following cannot be represented by resonance structures?

Dimethyl ether
Carboxylate anion
Toluene
Nitrate anion

8. The displacement of electrons in a multiple bond in the presence of attacking reagent is called

Hyperconjugation
Inductive effect
Electromeric effect
Resonance

9. Identify the chiral molecule among the following:

Isobutyl alcohol
Isopropyl alcohol
1-bromo 3-butene
2-Pentanal

10. If two compounds have the same empirical formula but different molecular formula they must have

Same vapour density
Different percentage composition
Different molecular weight₂
Same viscosity