Which of the following compounds gives a yellow solid product when reacted with $NaOI$?

Which of the following compounds is reduced to the corresponding hydrocarbon by $Zn-Hg$ and concentrated $HCl$?

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : $Image-I$ can be easily reduced using $Zn-Hg / HCl$ to $Image-II$.
Reason $R : Zn-Hg / HCl$ is used to reduce carbonyl group to $-CH_2-$ group.
In the light of the above statements,choose the correct answer from the options given below:

The reaction shown below proceeds via which mechanism?

Which of the following reagents can form a hydrazone with alkanone?

Product of the reaction is