2-Position in furan is more reactive than the 3-position towards electrophilic substitution

Write the structure of 3-methyl-1,3-thiozol.

Michael addition

Aldol condensation

Predict the product(s) and give the mechanism of the following reactions: 

Predict the major and minor products of the following reactions:

(i) Friedel-Crafts acylation of pyrrole

(ii) Friedel-Crafts alkylation of pyridine

What is Huckel’s rule? Which of the following compound(s) is aromatic? Justify your answer.

(i) Cycloctatatraene

(ii) Nitrobenzene

What do you understand by para-directing activators, para-directing deactivators and meta-directing deactivators? 

Differentiate Saytzeff and Hofmann rules giving suitable examples

Rate of reaction of acetaldehyde with aniline increases with the increase in acidity but beyond certain limit it decreases with further increase of acidity.

Electron withdrawing substituents at the carbonyl carbon increase the reactivity towards nucleophilic addition reactions.

Which of the following pair of carbocation is more stable and why?

Answer the questions given for the following reaction:

i) Write the electrophile participating in this reaction.

ii) Write the reagents used for the reaction.

iii) Name the reaction.

iv) Write the complete mechanism of the reaction.

Why is a substitution reaction proceeding by S_N2 mechanism referred sometimes as direct displacement process? Arrange the following aliphatic bromides in the increasing order of reactivity by S_N2  mechanism:

What is the principle of microscopic reversibility? How is it explained by the transition state theory of organic reactions? Explain with the help of an example.

Categorise the following reactions as oxidation or reduction reaction indicating the oxidation state of carbon in the reactants and the products for all the reactions:

List the factors that are responsible for the relative strength of nucleophiles. Write the conjugate acids of the following nucleophiles.

R₃N, RCHCN^- , ^-NH₂, Br^-, CH₃CH₂O^-

Why does nitrobenzene not undergo Friedel-Crafts alkylation?

How would you prepare the following?

(i) 3-Octyne from 1-hexyne

(ii) cis-3-Hexene from 3-hexyne 

Calculate the number of normal modes of vibration for the following compounds:

(i) H₂O 

(ii)  CH₄

(iii) HBr