Write the correct order of acidic strength fo | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The acidic strength of nitroalkanes depends on the stability of the conjugate base (carbanion) formed after the removal of an $\alpha$-hydrogen.$1

Vedclass · Accepted Answer

$IV > II > I > III$

Vedclass · Answer

(A) The acidic strength of nitroalkanes depends on the stability of the conjugate base (carbanion) formed after the removal of an $\alpha$-hydrogen.$1$. The stability of the carbanion is increased by the electron-withdrawing effect ($-I$ and $-M$ effects) of the $-NO_2$ groups.$2$. Comparing the compounds:$(I) \ CH_3NO_2$ has $3 \ \alpha$-hydrogens and one $-NO_2$ group.$(II) \ (NO_2)_2CH_2$ has $2 \ \alpha$-hydrogens and two $-NO_2$ groups.$(III) \ CH_3CH_2NO_2$ has $2 \ \alpha$-hydrogens and one $-NO_2$ group (the $+I$ effect of the $-CH_3$ group destabilizes the carbanion).$(IV) \ (NO_2)_3CH$ has $1 \ \alpha$-hydrogen and three $-NO_2$ groups.$3$. The order of stability of the resulting carbanions is $(IV) > (II) > (I) > (III)$.Therefore,the correct order of acidic strength is $IV > II > I > III$.

Column $-I$	Column $-II$
$(i)$ $C_6H_5NH_2$	$(p)$ $-R$ effect
$(ii)$ $C_6H_5OH$	$(q)$ $+R$ effect
$(iii)$ $C_6H_5NO_2$	$(r)$ $+I$ effect
$(iv)$ $CH_3CH_2Cl$	$(s)$ $-I$ effect

Write the correct order of acidic strength for the following:
$(I) \ CH_3 - NO_2$
$(II) \ NO_2 - CH_2 - NO_2$
$(III) \ CH_3 - CH_2 - NO_2$
$(IV) \ (NO_2)_3CH$

Similar Questions

Identify the type of electromeric effect ($E$-effect) in the following reactions:
$(a) >C=C< + CN^{-} \to -C(CN)-C^{-}-$
$(b) >C=C< + H^{+} \to -C^{+}-CH-$

The rate of attack of an electrophile is least when $X$ in the given compound is

Rank the following compounds in order of increasing acidity (weakest acid first).

Match column $-I$ and column $-II$ with the correct electronic effect relation:

Column $-I$ Column $-II$

$(i)$ $C_6H_5NH_2$ $(p)$ $-R$ effect

$(ii)$ $C_6H_5OH$ $(q)$ $+R$ effect

$(iii)$ $C_6H_5NO_2$ $(r)$ $+I$ effect

$(iv)$ $CH_3CH_2Cl$ $(s)$ $-I$ effect

Rank the hydrogen atoms $(H_a, H_b, H_c)$ present in the following molecule in decreasing order of their acidic strength.

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Write the correct order of acidic strength for the following:$(I) \ CH_3 - NO_2$$(II) \ NO_2 - CH_2 - NO_2$$(III) \ CH_3 - CH_2 - NO_2$$(IV) \ (NO_2)_3CH$