question_answer

Match the following

	Column - I		Column - II
[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

 

A)      A-1      B-4      C-3       D-5

B)      A-2      B-4      C-1       D-5

C)      A-5      B-1       C-4        D-2

D)       A-5     B-1      C-3       D-2

Correct Answer: B

Solution :

\[\underset{acetaldehyde}{\mathop{C{{H}_{3}}CHO}}\,\xrightarrow{Tautomerisation}\underset{vinyl\text{ }alcohol}{\mathop{C{{H}_{2}}=CH-OH}}\,\] Thus, these two are tautomers. Eclipsed and staggered ethane are two conformations of ethane. (+) 2-butanol and (-)2-butano are enantiomers as these are non-superimposable mirror images.                 \[\underset{(methyl-n-propyl\text{ }amine)}{\mathop{C{{H}_{3}}NH{{C}_{3}}{{H}_{7}}}}\,\] and        \[\underset{(diethylamine)}{\mathop{{{C}_{2}}{{H}_{5}}NH{{C}_{2}}{{H}_{5}}}}\,\] Due to difference in the nature of alkyl Groups attached to the same functional group, these are called metamers.