Question

Chem question!! please ppl explain to me this tiny question :3

Answer 1

here it is
the answer is C
but i don't get why

Answer 2

@emcrazy14 @Kainui @aaronq

Answer 3

strong acid will convert alcohols to alkenes, then the excess strong acid is neutralized by the strong base

Answer 4

@JFraser so conc H2SO4 is taking H2O out from alcohol thus forming alkene
but i don't get the part about dilute NaOH

Answer 5

when all the alcohol has been added, there is still some leftover H2SO4. to purify the alkene, the leftover H2SO4 must be neutralized. that's why NaOH is added as the second step

Answer 6

@JFraser but why is it dilute? not concentrated
could you please tell me what does reagent dil NaOH usually do to the compound and what does concentrated NaOH does?

Answer 7

if you add concentrated NaOH, you run the risk of having an excess of NaOH left over, which you'd have to neutralize with more strong acid. using a dilute solution means you can be more careful in neutralizing the excess acid

Answer 8

@JFraser i don't mean in this reaction, i just mean in general

Answer 9

concentrated NaOH with concentrated H2SO4 will also release a lot of heat, so dilute is safer for that reason. i'm not sure what concentrated NaOH will do to the alkene, i forget that part

Answer 10

I just have a little doubt that I want to clear out
So does that mean when it comes to turning alcohols to alkene; acids are not the only reagent?

Answer 11

the NaOH isn't used to dehdydrate the alcohol, the NaOH is used to neutralize the excess acid

Answer 12

Coz Its written in my book that powdered Al2O3 is used in dehydration of alcohol to alkene

Answer 13

i'm sure it can be. it acts as an oxidizing agent

Answer 14

Oh ok thank you sir

Answer 15

ohhh ok i get it now so as purification they mean neutralization of excess acid left out after forming alkene @JFraser

Answer 16

yes

Answer 17

owkkk thank you so much :* @JFraser

Answer 18

YW