Question

Which of the following anions is most basic?

Which of the following anions is most basic?

Question options:

	a) H2C $q17-1.png?_&d2lSessionVal=ZcZaJJw34MJQc8$ CH–
	b) CH3–
	c) HC $q17-2.png?_&d2lSessionVal=ZcZaJJw34MJQc8$ C –
	d) CH3C $q17-3.png?_&d2lSessionVal=ZcZaJJw34MJQc8$ C–
	e) (CH3)3C –

Answer 1

Solution:- (CH3)3C- anion is most basic. According to bronsted-Lowry concept- an acid is a proton donor i.e. protogenic and a base is proton acceptor i.e protophilic Hydrogen atom in alkyne are attached to the sp hybridized carbon atoms whereas they are attached to sp2 hybridized atoms in alkene and sp3 hybridized carbons in alkane. Due to the maximum percentage of s character (50%), the sp hybridized atoms in alkyne molecule have highest elecronegativity; hence, these attract the shared electron pair of the C-H bond of alkyne to a greater extent than that of the sp hybridized orbitals of carbon in alkene and the sp hybridized orbitals of carbon in alkane. Thus in alkyne, hydrogen atoms can be liberated as protons more easily as compared to the alkene and alkane. Hence, hydrogen atoms of the alkyne attached to triply bonded carbon atom are acidic in nature. So, the base strength is CH HyCAll the three CH3 group increasée electron dencity by (+)-I effect results difficult to deprotonat