261.

What happens when?
Ethyl chloride is treated with aqueous KOH.

What happens when?
methyl Bromide is treated with sodium in the presence of dry ether.

What happens when?
Methyl chloride is treated with KCN.

Toluene reacts with bromide in the presence of light to give benzyl bromide, while in presence of FeBr₃ it givesp-bromo toluene. Give explanation for the above observation.

Write the equations for the preparations of 1-iodobutane from 
1-butanol   

Write the equations for the preparations of 1-iodobutane from 
 1-chlorobutane

Write the equations for the preparations of 1-iodobutane from 
but-1-ene.

Arrange the following compounds in increasing order of S_N1 , respectively.
ClCH₂=CHCH₂CH_3, CH₃(Cl)=CHCH₂CH₃, CH₃ = CHCH₂ CH₂Cl, CH₃CH = CH. CHCl CH₃

Arrange the following compounds in increasing order of S_N1 , respectively.
CH₃CH₂Br, CH₂ = CHCH(Br)CH₃, CH₃CH(Br) CH₃