`R- OH overset(HX)underset(ZnCI_(3))(to)`

Which of the following reaction(s) can be used for the preparation of alkyl halides ? (i) CH_(3) CH_(2)OH+HCI overset("anhyd."ZnCI_(2))(to) (ii) CH_(3)CH_(2)OH+HCI to (iii) (CH_(3))_(3)C-OH +HCI to (iv) (CH_(3))_(2) CHOH +HCI overset("anhyd"ZnCI_(2))(to)

(A) overset(HCI+ZnCI_(2))larr Me_(3)C-CH_(2)OH overset(SOCI_(2))underset(PCI_(5))underset((or))rarr (B) (A) and (B) are:

(A) overset(HCI+ZnCI_(2))larr Me_(3)C-CH_(2)OH overset(SOCI_(2))underset(PCI_(5))underset((or))rarr (B) (A) and (B) are:

Name the following compounds according to IUPAC system. (i) CH_(3)-CH_(2)-underset(CH_(2)Cl)underset(|)(CH)-overset(CH_(2)OH)overset(|)(CH)-underset(CH_(3))underset(|)(CH)-CH_(3) (ii) CH_(3)-overset(CH_(3))overset(|)(CH)-CH_(2)-overset(OH)overset(|)(CH)-overset(CH_(2)OH)overset(|)(CH)-CH_(3) (iv) H_(2)C=CH-underset(OH) underset(|)(CH)-CH_(2)-CH_(2)-OH (v) CH_(2)-underset(CH_(3))underset(|)(C)=underset(Br)underset(|)(C)-CH_(2)OH

Predict the product in the following reactions: (i) H_(5)C_(6)-overset(OH)overset(|)underset(H)underset(|)(C)-overset(OH)overset(|)underset(H)underset(|)(C)-CH_(3)overset(H_(2)SO_(4))rarr (ii) H_(3)C-overset(OH)overset(|)underset(CH_(3))underset(|)(C)-underset(H)underset(|)overset(OH)overset(|)(C)-Hoverset(H_(2)SO_(4))rarr (iii) H_(5)C_(6)-overset(OH)overset(|)underset(C_(6)H_(5))underset(|)(C)-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-CH_(3)overset(H_(2)SO_(4))rarr

When pinacol is treated with dilute H_(2)SO_(4) , a re-arangement reaction takes place which leads to the formation of a ketone. CH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)C-underset(CH_(3))underset(|)overset(OH)C-CH_(3)overset(H_(2)SO_(4))rarrCH_(3)-underset(CH_(3))underset(|)overset(O)overset(||)C-overset(CH_(3))overset(|)C-CH_(5) This reaction involves re-arrangement of carbocation Step 1: CH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)C-underset(CH_(3))overset(+)overset(OH_(2))overset(|)C-CH_(2)rarrCH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)C-underset(CH_(3))underset(|)overset(OH)overset(|)C-underset(CH_(3))underset(|)overset(+)C-CH_(3) Step 2: Carbocation rearrange by hydride, alkyl shift to get as stable as they can. Stability is the driving force for re-arrangement migration of bond may also oC Cur. Where by ring expansion and ring contraction takes place. The relief of strain can provide a powerful driving force for re-arrangement. What will be the product of following reaction R is:

Assertion: PCl_(3) on hydrolysis gives OH-underset(H)underset(|)overset(O)overset(||)(P)-OH and not OH-underset(OH)underset(|)(P)-OH as major product. Reason: H_(3)PO_(3) exists in two tautomeric forms :OH-underset(OH)underset(|)(P)-OH hArr HO-underset(OH)underset(|)overset(O)overset(||)(P)-OH

Assertion: PCl_(3) on hydrolysis gives OH-underset(H)underset(|)overset(O)overset(||)(P)-OH and not OH-underset(OH)underset(|)(P)-OH as major product. Reason: H_(3)PO_(3) exists in two tautomeric forms :OH-underset(OH)underset(|)(P)-OH hArr HO-underset(OH)underset(|)overset(O)overset(||)(P)-OH