| 1. Hexa 1, 5 diene is a conjugated diene |
| 2. Prop 1, 2 diene is conjugated diene |
| 3. Hexa 1, 3 diene is a conjugated diene |
| 4. Buta 1, 3 diene is an isolated diene |
| 5. Prop 1, 2 diene is a cumulative diene |
A) 1, 2
B) 2, 3
C) 4, 5
D) 2, 5
E) 3, 5
Correct Answer: E
Solution :
In conjugated diene alternate single and double bonds are present while in cumulative diene, double bonds are present at adjacent positions. 1. \[\underset{hexa-1,\text{ }5-diene}{\mathop{{{H}_{2}}\overset{1}{\mathop{C}}\,=\overset{2}{\mathop{C}}\,H\overset{3}{\mathop{C}}\,{{H}_{2}}\overset{4}{\mathop{C}}\,{{H}_{2}}\overset{5}{\mathop{C}}\,H=\overset{6}{\mathop{C}}\,{{H}_{2}}}}\,\] \[\Rightarrow \]it is an isolated diene. 2.\[\underset{prop-1,\text{ }2-diene}{\mathop{{{H}_{2}}\overset{1}{\mathop{C}}\,=\overset{2}{\mathop{C}}\,=\overset{3}{\mathop{C}}\,{{H}_{2}}}}\,\Rightarrow \]It is a cumulative diene. 3. \[\underset{hexa-1,\text{ }3-diene}{\mathop{{{H}_{2}}\overset{1}{\mathop{C}}\,=\overset{2}{\mathop{C}}\,H=\overset{3}{\mathop{C}}\,H=\overset{4}{\mathop{C}}\,H\overset{5}{\mathop{C}}\,{{H}_{2}}\overset{6}{\mathop{C}}\,{{H}_{3}}}}\,\Rightarrow \]It is a conjugated diene. 4.\[\underset{buta-1,\text{ }3-diene}{\mathop{{{H}_{2}}\overset{1}{\mathop{C}}\,=\overset{2}{\mathop{C}}\,H-\overset{3}{\mathop{C}}\,H=\overset{4}{\mathop{C}}\,{{H}_{2}}}}\,\Rightarrow \]It is a conjugated diene. 5. Prop-1, 2-diene is a cumulative diene. Hence, statements 3 and 5 are correct.
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