• # question_answer The surface tension of several alcohols at $20{}^\circ C$ is $\gamma (C{{H}_{3}}OH)=22.61dyne\,\,c{{m}^{-1}},$$\gamma ({{C}_{2}}{{H}_{5}}OH)=2.275\times {{10}^{-2}}N{{m}^{-1}}$ and $\gamma ({{C}_{3}}{{H}_{7}}OH)=23.78\,\,J{{m}^{-2}}$. The alcohol having the highest surface tension is A)  $C{{H}_{3}}OH$               B)  ${{C}_{2}}{{H}_{5}}OH$ C)  ${{C}_{3}}{{H}_{7}}OH$                       D)  All are same

$\because$    $1\,N={{10}^{5}}\,\,\text{dyne}$ and       $1\,J=1\,\,Nm$ $\therefore$ ${{C}_{3}}{{H}_{7}}OH$ will have the highest surface tension.