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Q-19. The molecules having dipole moment are         .

(i) 2, 2-Dimethylpropane

(ii) trans-Pent-2-ene

(iii) cis-Hex-3-ene

(iv) 2, 2, 3, 3 - Tetramethylbutane.

 

Ans. (ii) and (iii)

Explanation:

In (ii) trans pent-2-ene

The bond moments of C—CH3 and C—CH2—CH3 are not cancelled exactly due to diffence in +I effect of —CH3 and —CH2—CH3 even they are opposite.

+I for —CH2—CH3 is more than —CH3

(iii) cis hex-3-ene

The bond moments of both C—CH2—CH3­ are equal but they are not opposite to each other and they are inclined to each other at an angle of 600, hence it has dipolemoment.