Question

Directions: The answer to the following question is a single digit integer ranging from 0 to 9. Enter the correct digit in the box given below.

How many open chain structures are possible for N-Methly butanamine (including it) that are referred to as metamers.

Answer 1

Correct Answer: 6

Explanation:
The molecular formula of N-methyl butanamine is $C_5{H}_{13}N$. Primary, secondary and tertiary amines are different functional groups and metamerism cannot coexist with functional isomerism. Hence, we shall consider only those isomers of N-methyl butanamine which are secondary $\left(2^o\right)$ amines.Group A: $\underset{\left(1\right)}{C{H}_{3}NH-C{H}_2-C{H}_{2}C{H}_2-C{H}_3}$ $\underset{\left(2\right)}{C{H}_3-NH-CH\left(C{H}_3\right)-C{H}_2-C{H}_3}$ $\underset{\left(3\right)}{C{H}_3-NH-C{H}_2-CH\left(C{H}_3\right)-C{H}_3}$ $\underset{\left(4\right)}{C{H}_3-NH-C{\left(C{H}_3\right)}_2-C{H}_3}$Group B: $\underset{\left(5\right)}{C{H}_3-C{H}_2-NH-C{H}_2-C{H}_2-C{H}_3}$ $\underset{\left(6\right)}{C{H}_3-NH-CH{\left(C{H}_3\right)}_2}$Every molecule of group A is a metamer of every molecule in group B.Therefore, there are 6 possible open structure of N-methy1 butanamine.Hence, the correct answer is 6.