Haloalkanes and...

When octa-O-methyl d-cellobiose is hydrolysed by aqueous acid, two O-methylated glucose derivatives are formed:  One is tetramethyl derivative and the other is trimethyl derivative. Why is a single methyl substituent lost in this process ? 

Ethyl chloride is converted to butane by :

Chloroethane is reacted with alcoholic potassium hydroxide. The product formed is:

Reaction of ethyl chloride with sodium leads to (in the presence of dry ether):

$$1$$-Chlorobutane on reaction with alcoholic potash gives:

In the dehydrohalogenation of ethyl chloride, which of the following change occurs?

Ethyl bromide on boiling with alcoholic solutions of sodium hydroxide forms:

Reaction of alkyl halide with metallic sodium in presence of dry ether solution is called:

Which of the following reagents, when heated with ethyl chloride, forms ethylene?

The reaction conditions leading to the best yield of $$C_{2}H_{5}Cl$$ are: