Pairs of compounds among the following is a pair of enantiomers:

1.
2.
3.
4.

The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II), and nitrobenzene (III) is:

1. III > II > I

2. II > III > I

3. I < II > III

4. I > II > III

Which of the following orders of acid strength is correct:

1. RCOOH > ROH > HOH > HC ≡ CH

2. RCOOH > HOH > ROH > HC ≡ CH

3. RCOOH > HOH > HC ≡ CH > ROH

4. RCOOH > HC ≡ CH > HOH > ROH

The correct IUPAC name, among the following, is:

Which of the following statements is correct?

An organic liquid vaporises at a temperature___________ its boiling point in steam distillation.

1. Above

2. Below

3. Equal to

4. None of the above

An organic compound contains 69% carbon, and 4.8% hydrogen, the remainder being oxygen. The masses of carbon dioxide, and water produced when 0.20 g of this substance is subjected to complete combustion would be respectively -

1. 0.506 g, 0.0864 g

2. 0.906 g, 0.0864 g

3. 0.0506 g, 0.864 g

4. 0.0864 g, 0.506 g

A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 mL of 0.5 M ${\mathrm{H}}_2{\mathrm{SO}}_4$. The residual acid required 60 mL of 0.5 M solution of NaOH for neutralization. The percentage composition of nitrogen in the compound is:

In the organic compound
$$CH₂=CH–CH₂–CH₂–C≡CH, which pair of hybridized orbitals is involved in forming the C₂–C₃ bond?
1. sp – ${\mathrm{sp}}^2$ 

2. sp – ${\mathrm{sp}}^3$

3. ${\mathrm{sp}}^2$ – ${\mathrm{sp}}^3$

4. ${\mathrm{sp}}^3$ – ${\mathrm{sp}}^3$

The correct statement regarding ambident nucleophiles is:

1. Nucleophiles have equal atomic weight.

2. Nucleophiles have only five electrons.

3. Nucleophiles have two nucleophilic sites.

4. Nucleophiles have two electrophilic sites.