$A$ compound has a vapour density of $29$. On warming with an aqueous solution of alkali,it gives a yellow precipitate. The compound is

Consider the following sequence of reactions:
$Benzene$ $\xrightarrow{CO, HCl, \text{anhydrous } AlCl_3/CuCl} A$ $\xrightarrow{B, OH^-, 293 K} \text{Chalcone (1,3-diphenylprop-2-en-1-one)}$
The substance $B$ is:

Which of the following is $D$ in the given reaction sequence?
$(CH_3)_3C-CH_2OH$ $\xrightarrow{PCC} B$ $\xrightarrow{Conc. NaOH} A + C$ $\xrightarrow{NaOH/CaO, \Delta} D$

Identify the major product $A$ in the following reaction:
[Image of the reaction: $A$ substituted tetralin derivative with a ketone group,a chlorine atom,and a nitro group,reacting with $N_2H_4/KOH/H_2O$ (Wolff-Kishner reduction)]

$CH_3COOH$ $\xrightarrow{LiAlH_4} X$ $\xrightarrow{Cu, 300^{\circ}C} Y$ $\xrightarrow{\text{Dilute } NaOH} Z$. In the above reaction,$Z$ is:

Grignard reagent is added to .......