Compound which shows positive mesomeric effect

Question

Compound which shows positive mesomeric effect (A)  CH2 = CH - Cl  (B)  C6H5 - N+ -Me3  (C)  CH2 = CH - CH2Cl  (D)  C6H5 - CH = CHCl

Tardigrade Admin · Accepted Answer

Compound in which lone pair of electrons are in conjugation with an unsaturated system, exhibit positive mesomeric effect <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/e61200347ea173cb752ae97475b4f586-.jpeg" /> Thus, CH2 = CH—Cl and C6H5CH= CHCl both exhibit positive mesomeric effect

Q. Compound which shows positive mesomeric effect

$C H_{2} = C H - Cl$

$C_{6} H_{5} -$ $N^{+}$ $- M e_{3}$

$C H_{2} = C H - C H_{2} Cl$

$C_{6} H_{5} - C H = C H Cl$

Compound in which lone pair of electrons are in conjugation with an unsaturated system, exhibit positive mesomeric effect

Thus, $C H_{2} = C H — Cl$ and $C_{6} H_{5} C H = C H Cl$ both exhibit positive mesomeric effect

Q. Compound which shows positive mesomeric effect

CH2​=CH−Cl

C6​H5​− N+ −Me3​

CH2​=CH−CH2​Cl

C6​H5​−CH=CHCl

Compound in which lone pair of electrons are in conjugation with an unsaturated system, exhibit positive mesomeric effect Thus, CH2​=CH—Cl and C6​H5​CH=CHCl both exhibit positive mesomeric effect

$C H_{2} = C H - Cl$

$C_{6} H_{5} -$ $N^{+}$ $- M e_{3}$

$C H_{2} = C H - C H_{2} Cl$

$C_{6} H_{5} - C H = C H Cl$

Compound in which lone pair of electrons are in conjugation with an unsaturated system, exhibit positive mesomeric effect

Thus, $C H_{2} = C H — Cl$ and $C_{6} H_{5} C H = C H Cl$ both exhibit positive mesomeric effect