Identify the compound $C$ in the following sequence:
$(CH_3)_2CHCH_2C \equiv N$ $\xrightarrow{HCl, H_2O} \text{compound } A$ $\xrightarrow[2. H_2O]{1. LiAlH_4} \text{compound } B$ $\xrightarrow{PCC, CH_2Cl_2} \text{compound } C$

In the sequence of the following reactions $CH_3CH_2OH$ $\xrightarrow{[O]}$ $X$ $\xrightarrow{[O]}$ $CH_3COOH$,$X$ is

Acetophenone can be obtained by the distillation of:

$A$ man has been asked to synthesize the molecule shown in the image. He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing an ozonolysis reaction on an alkene to produce a dicarbonyl compound,followed by an aldol reaction to prepare "$x$". Predict the suitable alkene that can lead to the formation of "$x$".

$R-C \equiv N + SnCl_2 + HCl$ $\longrightarrow A$ $\xrightarrow{H_3O^+} RCHO$. The above reaction is known as:

$R-CN \xrightarrow[(ii) H_2O]{(i) DIBAL-H} R-Y$
Consider the above reaction and identify $Y$.