Which of the following compounds does not exh | vedclass

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Question

(C) Keto-enol tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to the carbonyl group $(C=O)$.$(1)$ $1,3$-cyclohexaned

Vedclass · Accepted Answer

$3$

Vedclass · Answer

(C) Keto-enol tautomerism requires the presence of at least one $\alpha$-hydrogen atom adjacent to the carbonyl group $(C=O)$.$(1)$ $1,3$-cyclohexanedione has $\alpha$-hydrogens and exhibits tautomerism.$(2)$ The structure shown has an $\alpha$-hydrogen at the $sp^3$ carbon,allowing for tautomerism.$(3)$ $1,4$-benzoquinone has no $\alpha$-hydrogen atoms adjacent to the carbonyl groups,as all carbons in the ring are either part of a double bond or bonded to the carbonyls,thus it cannot exhibit keto-enol tautomerism.$(4)$ This is an enol form itself,which can tautomerize to the corresponding aldehyde.Therefore,the correct answer is $3$.

$A$. Acetaldehyde,vinyl alcohol	$1$. Enantiomers
$B$. Eclipsed and staggered ethane	$2$. Tautomers
$C$. $(+)2$-butanol,$(-)2$-butanol	$3$. Chain isomers
$D$. Methyl-$n$-propylamine and diethylamine	$4$. Conformational isomers
	$5$. Metamers

Which of the following compounds does not exhibit keto-enol tautomerism?

Similar Questions

Match the following:
$A$. Acetaldehyde,vinyl alcohol $1$. Enantiomers
$B$. Eclipsed and staggered ethane $2$. Tautomers
$C$. $(+)2$-butanol,$(-)2$-butanol $3$. Chain isomers
$D$. Methyl-$n$-propylamine and diethylamine $4$. Conformational isomers
$5$. Metamers

Which one of the following is most reactive towards electrophilic reagent?

The enol form in which ethyl $3$-oxobutanoate exists is

Among the following,the structure which does $NOT$ represent $2-$methyl butane is:

$(i)$ Number of geometrical isomers for the given structure $X$:
(Image provided)
$(ii)$ Number of cyclic structural isomers with molecular formula $C_5H_{10} = Y$
$(iii)$ Number of ethers with molecular formula $C_4H_{10}O = Z$
Find the value of $X + Y + Z$.

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