Question

Please answer all 3 questions

Which represents a pair of resonance structures? NH NH2 and H3C Hgc 9 CC=CH2 and 1 Hac H H H CH OH O and OOH нссон and TH H Hyc Copt н" 3 OO QUESTION 27 How many stereoisomers of 3-penten-2-ol exist? 2 3 4 0 0 QUESTION 28 What is the approximate dihedral angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane? 0° 60° 120° 180° MacBoo

Answer 1

Concept: In resonating structures

1. All atom will remain at same position

2. No of bonds will be same

3. Only position of double bond involve in resonance get changed

So, among the given pairs only 2 pair represent resonance structure.

Hence option (B) 2 is Correct.

Answer27: Four streoisomer will be for 3-Pentene-2-ol...which are (E)-2S, (E)-2R, (Z)-2S and (Z)-2R-

Hence option (C) 4 is Correct.

Answer 28. The angel between two chlorine atom in equatorial postion in trans-1,2-dichlorocyclohexane is 60 Degree. Hence option (B) 60 Degree is Correct.

Thank you