The reaction of $50\%$ aq $KOH$ on an equimolar mixture of $4-$methylbenzaldehyde and formaldehyde followed by acidification gives

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

Which of the following will give $-ve$ Tollen's but $+ve$ Iodoform test?

In the reaction sequence,
the major products $X$ and $Y$ respectively are

Aldol condensation of acetaldehyde involves the formation of which of the following intermediates?

$A$ compound having molecular formula $C_3H_6O$,on reaction with $NH_2NHCONH_2$ produces mainly $P$ (which shows stereoisomerism). $P$ on reaction with $KOH$ / ethylene glycol,$\Delta$ produces propane. Identify $(P)$.