Intake of small quantity of methanol can be lethal. Comment.

What happens when (Give equations also):
$(i)$ Methane reacts with excess of chlorine in the presence of diffused sunlight.
$(ii)$ Ethanol undergoes combustion.
$(iii)$ Ethyl alcohol reacts with acidified potassium dichromate.

Name an element,other than carbon,which exhibits the property of catenation up to seven or eight atoms. Are these compounds stable?

$A$ molecule of ammonia has the formula $NH_{3}$. Predict the total number of bonds present around the nitrogen atom.

Write true or false for the following statement:
Esters react in the presence of an acid or a base to give back the alcohol and carboxylic acid.

Which condensation polymer is formed from hexamethylenediamine and adipic acid?