Role of alc. KOH and aq. KOH

For carbylamine reaction, we need hot alc. KOH and

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

The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in the presence of alcoholic KOH, alkenes are major products. Explain.

The correct order for E_(2) reaction with alc. KOH will be :-

In dénydrohalogenation of tert-pentyl bromide using alc. KOH, major product obtained is

Ethylidene chloride on treatement with aq. KOH gives

Ethylidene chloride on treatement with aq. KOH gives