Consider the following reaction. The structure of the main product will be

Product $(D)$ in the above sequence is:

The major product formed in the following reaction is:

Of the following,which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

Compound $(A)$,$C_6H_{12}O_3$,when treated with $I_2$ in aqueous sodium hydroxide gives a yellow precipitate. When $(A)$ is treated with Tollens' reagent,no reaction occurs. When $(A)$ is hydrolysed and then treated with Tollens' reagent,a silver mirror is formed in the test tube. Compound $(A)$ will be

Explain the preparation of hydrocarbon compounds by the Clemmensen reduction reaction.