| Directions : (6 - 10) |
| Case II : Read the passage given below and answer the following questions. |
| Williamson's synthesis is used for the preparation of symmetrical as well as unsymmerical ether. It is \[{{S}_{N}}2\] reaction mechanism. In Williamson's synthesis, \[1{}^\circ \] alkyl halide are used for preparation of ethers because \[2{}^\circ \] and \[3{}^\circ \] alkyl halide give alkene. Ethers are cleaved by hydrogen halides to alcohol and alkyl halide where alkyl halide is corresponding to that alkyl which has less number of carbon atom (it is because of less steric hindrance). In polar media unsymmetrical ether like tertiary butyl ethyl ether gives ethyl alcohol and tertiary butyl halide as reaction proceeds via carbocation formation. |
| In the following questions (Q. No. 6-10), a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage. |
| Assertion : Rate of reaction of alkyl halide in Williamson's synthesis reaction is \[1{}^\circ RX\text{ }>\text{ }2{}^\circ RX\text{ }>\text{ }3{}^\circ RX\]. |
| Reason : It is a type of bimolecular substitution reaction (\[{{S}_{N}}2\]). |
A) Assertion and reason both are correct statements and reason is correct explanation for assertion.
B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C) Assertion is correct statement but reason is wrong statement.
D) Assertion is wrong statement but reason is correct statement.
Correct Answer: A
Solution :
Williamson's synthesis occurs by \[{{S}_{N}}2\] mechanism and primary alkyl halides are most reactive in \[{{S}_{N}}2\] reactions.
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