Give the major organic product of the following reaction.

The starting material is $2,3-\text{dimethylbut-2-ene}$. It undergoes ozonolysis followed by reduction with $Zn/H_2O$ to form product $A$. Product $A$ then reacts with $CH_3MgBr$ followed by hydrolysis to form product $B$. Identify product $B$.

The major product formed in the following reaction is:

In the given reaction,the number of chiral carbon$(s)$ in product $A$ is .......
(Where $Et$ is $-C_2H_5$)

When cyclohexanone reacts with dimethylamine in the presence of a catalytic amount of acid,water is continuously removed during the reaction. What is the product commonly called?

Aldehydes are more reactive than ketones towards nucleophilic attack because of?