STD 11 - 8.2 Organic chemistry isomerism — JEE STD 11 Science — Question

$\mathop {\mathop {\mathop {H - \mathop {{\text{ }}C}\limits_|^|  - Cl}\limits_{H{\kern 1pt}  - {\kern 1pt} \mathop {{\text{ }}C}\limits_| {\kern 1pt}  - {\kern 1pt} H}^{H{\kern 1pt}  - {\kern 1pt} \mathop {{\text{ }}C}\limits^| {\kern 1pt}  - {\kern 1pt} Cl} }\limits_{\;\;{\kern 1pt} C{H_3}}^{\;\;\;C{H_3}} }\limits_{{\text{2}},{\text{3dichloropentane}}} \mathop {{H_3}C - \mathop {\mathop {\mathop {{\text{ }}C}\limits_|^| }\limits_H  - COOH}\limits^{OH\,\,\,\,\,\,\,\,\,\,\;\;\;\;\;\;\;} }\limits_{{\text{2hydroxypropanoicacid}}} $