Question

Question: How is each compound related to A? Choose from tautomers, constitutional isomers but not tautomers, or neither

A.

Short answer

Answer

1. Tautomer
2. Constitutional isomer
3. Constitutional isomer
4. Neither

Step-by-step solution

Step-by-Step Solution Step 1: Tautomer and constitutional isomer

Isomers have the same molecular formula, but they differ in the structural arrangement of atoms. Tautomers are constitutional isomers differing only in the position of a double bond and hydrogen atom.

The carbonyl group generates an enol tautomer when protonated. The identification of tautomer is the OH group in enol form is attached with one of the double-bonded carbon.

Identification of tautomer and constitutional isomer

a. Same numbers of C, H and O atoms. The OH group is attached with a double bond. Therefore, the given structure is a tautomer of A.

Tautomer of A

b. Same numbers of C, H and O atoms, but OH group is not attached with a double bond. Therefore, the given structure is a constitutional isomer of A.

Constitutional isomer of A

c. Same numbers of C, H and O atoms, but OH group is not attached with a double bond. Therefore, the given structure is a constitutional isomer of A.

Constitutional isomer of A

d. The structure has one extra carbon atom compared to A. Therefore, the structure isneither a tautomer nor a constitutional isomer of A.

Structure not related to A