Dimethyl ketones are usually characterized through

Aldol condensation will not take place in

Identify the product $P$ from the following sequence of reactions?

Predict the product when the given compound $(A)$ reacts with $NaBH_4$.

Identify the reagents $(1-4)$ required for the transformations shown and arrange them in the correct order.
$(1)$ $LiAlH_4$
$(2)$ $OsO_4$
$(3)$ $NaIO_4$
$(4)$ $NaBH_4$

The product $A$ in the following reaction is: