General Organic Chemistry · Chemistry · COMEDK

Two statements, one Assertion and the other Reason are given. Choose the correct option.

Assertion: Heterocyclic compounds like Pyridine and Thiophene are non-aromatic compounds.

Reason: According to Huckel rule for a given compound to exhibit aromaticity, the molecule must be planar, cyclic system having delocalised $(4 n+2) \pi$ electrons.

Arrange the following free radicals in the increasing order of their stability:

A	B	C	D

Arrange the following in the decreasing order of their $\mathrm{pK}_{\mathrm{a}}$ values.

Identify the compound which is non-aromatic in nature.

Which of the following carbanions is the least stable?

Which of the following is not aromatic?

From the following compounds, identify the one which is most acidic.

Arrange the following compounds in the decreasing order of reactivity towards $$\mathrm{S}_{\mathrm{N}} 1$$ reaction.

Given below are 4 species with one odd electron on the Carbon atom.

$$\begin{array}{ll} \mathrm{A}=\left(\mathrm{CH}_3\right)_3 \stackrel{\bullet}{\mathrm{C}} & \mathrm{B}=\left(\mathrm{C}_6 \mathrm{H}_5\right)_3 \stackrel{\bullet}{\mathrm{C}} \\ \mathrm{C}=\left(\mathrm{C}_6 \mathrm{H}_5\right)_2 \stackrel{\bullet}{\mathrm{C}} \mathrm{H} & \mathrm{D}=\left(\mathrm{CH}_3\right)_2 \stackrel{\bullet}{\mathrm{C}} \mathrm{H} \end{array} $$

Choose the correct decreasing order of stability of the species.

Rank the following compounds in order of increasing basicity.

Select the strongest base from the given compounds:

[A] p- $$\mathrm{NO}_2-\mathrm{C}_6 \mathrm{H}_4 \mathrm{NH}_2$$

[B] $$\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2-\mathrm{NH}_2$$

[C] $$\mathrm{m}-\mathrm{NO}_2-\mathrm{C}_6 \mathrm{H}_4 \mathrm{NH}_2$$

[D] $$\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$$

Which one of the following statements is correct?

Arrange stability of the given carbon cation in decreasing order

+I-effect is shown by