Question

In how many of the following reactions regioselectivity can be observed.
(I). `CH_(3)-overset(CH_(3))overset(|)(C)H-CH_(2)-Ohunderset(Delta)overset(con" "H_(2)SO_(4))to`
(II). `CH_(3)-CH_(2)-CH_(2)-underset(OH)underset(|)(C)H_(2)underset(Delta)overset(Al_(2)O_(3))to`
(III). `CH_(3)-overset(CH_(3))underset(Br)overset(|)(C)-CH_(2)-CH_(2)-CH_(3)underset(Delta)overset(alc.KOH)to`
(IV). `CH_(3)-CH_(2)-underset(Br)underset(|)(C)H-CH_(2)-CH_(3)underset(Delta)overset(Alc.KOH)to`

Answer 1

Correct Answer - 1

Answer 2

here the reaction is regioselective which means two products (or more) are possible but one is major either saytzeff or hoffman alkene. regioselectivity means picking of different h from coumpand. first two rxns reagent doesn't pick hydrogen. whereas thrid rxn two products are formed by diff selection of hydrogen picking by koh. 4 th rxn only one product is possible.

Answer 3

Regeo selective means - two products (or more) are possible but one is a major product.

Here, In option(i), (ii) and (iii) we got only

One product but in option(iii) we got two type of product and one is major product.