If electronegativity of element A,B,C & D are 1.2, 3, 1.8 & 2.8 respectively then which of the following hydroxide is most basic in nature in aqueous solution:- Question Type: Single Correct Type
(1) A-O-H
(2) B-O-H
(3) C-O-H
(4) D-O-H

Explanation

(i) `underset("Iodoethane")(CH_(3)CH_(2)I) underset(-NaI)overset(NaCN)to underset("Propanenitrile (A)")(CH_(3)CH_(2)CN) underset(("Partial hydrolysis"))overset(OH^(-))to underset("Ethanamide (B)")(CH_(3)-overset(O)overset(||)(C)-NH_(2)) underset(("Hofmann bromamide reaction"))overset(NaOH+Br_(2))to underset("Methanamine (C)")(CH_(3)-NH_(2))`
(ii) `underset("Benzenediazonium chloride")(C_(6)H_(5)N_(2)Cl) underset(("Sandmeyer reaction"))overset(CuCN)to underset("Benzonitrile")(C_(6)H_(5)CN) underset("Hydrolysis")overset(H_(2)O //H^(+))to underset("Benzoic acid (B)")(C_(6)H_(5)COOH) [C_(6)H_(5)COONH_(4)] underset(-H_(2)O)overset(Delta)to underset("Benzamide (C)")(C_(6)H_(5)CONH_(2))`
(iii) `underset("Bromoethane")(CH_(3)CH_(2)Br) overset(KCN) to underset("Propanenitrile (A)")(CH_(3)CH_(2)CN) underset(("Reduction"))overset(LiAlH_(4)) to underset("Propan-1-amine (B)")(CH_(3)CH_(2)CH_(2)NH_(2)) underset(("Diazotisation"))overset(HNO_(2),0%)to [CH_(3)CH_(2)CH_(2)overset(+)(N)-=NCl^(-)] underset(-N_(2),-HCl )overset(H_(2)O)to underset("Propanol (C)")(CH_(3)CH_(2)CH_(2)OH)`
(iv) `underset("Nitrobenzene")(C_(6)H_(5)NO_(2)) underset(("Reduction"))overset(Fe//HCl)to underset("Aniline (A)")(C_(6)H_(5)NH_(2)) underset(273K)overset(NaNO_(2)+HCl) to underset("Benzenediazonium chloride (B)")(C_(6)H_(5)overset(+)(N)-=HCl^(-)) underset(Delta)overset(H_(2)O //H^(+))to underset("Phenol (C)")(C_(6)H_(5)OH)`
(v) `underset("Ethanoic acid")(CH_(3)COOH) underset(Delta)overset(NH_(3))to underset("Ethanamide (A)")(CH_(3)CONH_(2)) underset(("Hofmann bromamide reation"))overset(NaOBr)to underset("Methanamide (B)")(CH_(3)CH_(2)) overset(NaNO_(2)//HCl)to underset("Methanol (C)")(CH_(3)OH)`.