$4$-formylbenzoic acid on treatment with one equivalent of hydrazine followed by heating with alc. $KOH$ gives the major product:

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)]

The haloform test is given by which of the following substances?

Given below are two statements:
Statement $I$: Cross aldol condensation between two different aldehydes will always produce four different products.
Statement $II$: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH,it forms a condensation product with acetophenone only.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following reducing reagents will be suitable for the conversion shown below?
(Structure: $3-$methylcyclohexanone to methylcyclohexane)

Which of the following is a nucleophilic addition reaction?