નીચે આપેલ સંયોજનના ઉત્કલન બિંદુનો વધતો ક્રમ કયો છે?

$\mathop {{C_2}{H_5}OH}\limits_{\left( I \right)} $ $\mathop {{C_2}{H_5}Cl}\limits_{\left( {II} \right)} $ $\mathop {{C_2}{H_5}C{H_3}}\limits_{\left( {III} \right)} $ $\mathop {{C_2}{H_5}OC{H_3}}\limits_{\left( {IV} \right)} $

Q: નીચે આપેલ સંયોજનના ઉત્કલન બિંદુનો વધતો ક્રમ કયો છે? $\mathop {{C_2}{H_5}OH}\limits_{\left( I \right)} $ $\mathop {{C_2}{H_5}Cl}\limits_{\left( {II} \right)} $ $\mathop {{C_2}{H_5}C{H_3}}\limits_{\left( {III} \right)} $ $\mathop {{C_2}{H_5}OC{H_3}}\limits_{\left( {IV} \right)} $

a $(I)$ $C_2H_5OH$ Hydrogen bonding Hydrogen bonding $>$ Dipole -Dipole $(II)$ $C_2H_5Cl$ Dipole-Dipole $C_2H_5Cl$ is more polar than $C_2H_5OCH_3$ so, Dipole-Dipole $C_2H_5Cl$ $>$ Dipole-Dipole $C_2H_5OCH_3$ $(III)$ $C_2H_5CH_3$ No hydrogen bonding and dipole- dipole interaction $(IV)$ $C_2H_5OCH_3$ Dipole-Dipole Boiling points order is- $(III) < (IV) < (II) < (I) $.

Question

નીચે આપેલ સંયોજનના ઉત્કલન બિંદુનો વધતો ક્રમ કયો છે?

$\mathop {{C_2}{H_5}OH}\limits_{\left( I \right)} $ $\mathop {{C_2}{H_5}Cl}\limits_{\left( {II} \right)} $ $\mathop {{C_2}{H_5}C{H_3}}\limits_{\left( {III} \right)} $ $\mathop {{C_2}{H_5}OC{H_3}}\limits_{\left( {IV} \right)} $

A$(IIl) < (IV) <(II) <(I)$
B$(IV) < (III) < (I) < (II)$
C$(II) < (III) < (IV) < (I)$
D$(III) < (II) < (I) < (IV)$

JEE MAIN 2017, Diffcult

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Solution

a
$(I)$ $C_2H_5OH$ Hydrogen bonding Hydrogen bonding $>$ Dipole -Dipole

$(II)$ $C_2H_5Cl$ Dipole-Dipole $C_2H_5Cl$ is more polar than $C_2H_5OCH_3$ so, Dipole-Dipole $C_2H_5Cl$ $>$ Dipole-Dipole $C_2H_5OCH_3$

$(III)$ $C_2H_5CH_3$ No hydrogen bonding and dipole- dipole interaction

$(IV)$ $C_2H_5OCH_3$ Dipole-Dipole

Boiling points order is-

$(III) < (IV) < (II) < (I) $.

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