Addition of alcohols to aldehydes in the presence of anhydrous acids yields:

Observe the following set of reactions. What are $X, Y$ and $Z$ respectively?

Which of the following compounds does not undergo aldol condensation?

What are the products formed when an aldehyde $(R-CHO)$ is reacted with Tollen's reagent?

Calcium butanoate on heating followed by treatment with $1,2-$ethanediol in the presence of a catalytic amount of an acid,produces a major product which is

Following compounds are given:
$(i) CH_3-CH_2-OH$
$(ii) CH_3-CO-CH_3$
$(iii) CH_3-CH(OH)-CH_3$
$(iv) CH_3-OH$
Which of the above compound$(s)$,on being warmed with iodine solution and $NaOH$,will give iodoform?