Alcohols Phenols And Ethers Question 110
Question: Dehydration of alcohols by conc. $ H_2SO_4 $ takes place according to following steps: The slowest and fastest steps in the above reaction are
Options:
A) step 1 is slowest, while 3 is fastest.
B) step 2 is slowest, while 3 is fastest.
C) step 2 is slowest, while 4 is fastest.
D) all steps proceed at equal rate.
Show Answer
Answer:
Correct Answer: B
Solution:
[b] Step 2 involves the formation of carbonium ion by the loss of weakly basic $H _{2}O$ molecule. It is slowest step. Step 4 involves the conversion of an unstable (or intermediate) into a quite stable product, hence it is fastest step.
BETA
