Page 1
JEE Solved Example on Isomerism
JEE Mains
Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain.
(A) I
(B) II
(C) III
(D) IV
Ans: (B) All groups are as far apart as possible.
Q2: The IUPAC name of the compound:
(A) ( ???? , ???? , ???? )-octa-2,4,6-triene
(B) ( ???? , ???? , ???? )-octa-2,4,6-triene
(C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
(D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene
Page 2
JEE Solved Example on Isomerism
JEE Mains
Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain.
(A) I
(B) II
(C) III
(D) IV
Ans: (B) All groups are as far apart as possible.
Q2: The IUPAC name of the compound:
(A) ( ???? , ???? , ???? )-octa-2,4,6-triene
(B) ( ???? , ???? , ???? )-octa-2,4,6-triene
(C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
(D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene
Q3: How many spatial orientations are possible in the following compound?
(A) 2
(B) 4
(C) 6
(D) 8
Ans: (D) 3-stereo centers and no POS in any compound
? Stereo isomers = 2
3
= 8
Q4: How are compounds I and II are related?
(A) Enantiomers
(B) Diastereomers
(C) Constitutional
(D) Identical
Ans: (C) Compounds are (C) constitutional isomers
Page 3
JEE Solved Example on Isomerism
JEE Mains
Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain.
(A) I
(B) II
(C) III
(D) IV
Ans: (B) All groups are as far apart as possible.
Q2: The IUPAC name of the compound:
(A) ( ???? , ???? , ???? )-octa-2,4,6-triene
(B) ( ???? , ???? , ???? )-octa-2,4,6-triene
(C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
(D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene
Q3: How many spatial orientations are possible in the following compound?
(A) 2
(B) 4
(C) 6
(D) 8
Ans: (D) 3-stereo centers and no POS in any compound
? Stereo isomers = 2
3
= 8
Q4: How are compounds I and II are related?
(A) Enantiomers
(B) Diastereomers
(C) Constitutional
(D) Identical
Ans: (C) Compounds are (C) constitutional isomers
Q5: The non identical species are:
Sol 5: (B)
Page 4
JEE Solved Example on Isomerism
JEE Mains
Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain.
(A) I
(B) II
(C) III
(D) IV
Ans: (B) All groups are as far apart as possible.
Q2: The IUPAC name of the compound:
(A) ( ???? , ???? , ???? )-octa-2,4,6-triene
(B) ( ???? , ???? , ???? )-octa-2,4,6-triene
(C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
(D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene
Q3: How many spatial orientations are possible in the following compound?
(A) 2
(B) 4
(C) 6
(D) 8
Ans: (D) 3-stereo centers and no POS in any compound
? Stereo isomers = 2
3
= 8
Q4: How are compounds I and II are related?
(A) Enantiomers
(B) Diastereomers
(C) Constitutional
(D) Identical
Ans: (C) Compounds are (C) constitutional isomers
Q5: The non identical species are:
Sol 5: (B)
Q6: Which statement is correct about the following structures
Ans: (C) I and II are enantiomers as they are nonsuperimposable mirror image of each other.
I, II and are all structural isomer as they have same molecular formula.
Page 5
JEE Solved Example on Isomerism
JEE Mains
Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain.
(A) I
(B) II
(C) III
(D) IV
Ans: (B) All groups are as far apart as possible.
Q2: The IUPAC name of the compound:
(A) ( ???? , ???? , ???? )-octa-2,4,6-triene
(B) ( ???? , ???? , ???? )-octa-2,4,6-triene
(C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
(D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene
Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene
Q3: How many spatial orientations are possible in the following compound?
(A) 2
(B) 4
(C) 6
(D) 8
Ans: (D) 3-stereo centers and no POS in any compound
? Stereo isomers = 2
3
= 8
Q4: How are compounds I and II are related?
(A) Enantiomers
(B) Diastereomers
(C) Constitutional
(D) Identical
Ans: (C) Compounds are (C) constitutional isomers
Q5: The non identical species are:
Sol 5: (B)
Q6: Which statement is correct about the following structures
Ans: (C) I and II are enantiomers as they are nonsuperimposable mirror image of each other.
I, II and are all structural isomer as they have same molecular formula.
Q7: Which will form geometrical isomers?
Ans: (D)
As form of ring is also formed. Ans (D)
Q8: If optical rotation produced by (A) is +36o then optical rotation produced by (B) will be ?
(A) + ????
°
(B) ?? °
(C) + ????
°
(D) Unpredictable
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