(c) Alkenes, such as 2-methylbut-2-ene can be converted into an alcohol in a two-stage process.
(i)
Outline the mechanism for the reaction of 2-methylbut-2-ene with concentrated H2SO4.
[4 Marks]
(ii)
If the product formed in part (c) (i) is added to cold water and warmed gently, an alcohol is formed.
[1 Mark]
Draw the structure of this alcohol.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2