Pick out the correct statements from the following and choose the correct answer from the codes given below 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

Question

Pick out the correct statements from the following and choose the correct answer from the codes given below 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

Tardigrade Admin · Accepted Answer

In conjugated diene alternate single and double bonds are present while in cumulative diene, double bonds are present at adjacent positions.
1.

h e x a - 1, 5 - d i e n e H_{2} C 1 = C 2 H C 3 H_{2} C 4 H_{2} C 5 H = C 6 H_{2}

\Rightarrow

it is an isolated diene.
2.

p ro p - 1, 2 - d i e n e H_{2} C 1 = C 2 = C 3 H_{2} \Rightarrow

It is a cumulative diene.
3.

h e x a - 1, 3 - d i e n e H_{2} C 1 = C 2 H = C 3 H = C 4 H C 5 H_{2} C 6 H_{3} \Rightarrow

It is a conjugated diene.
4.

b u t a - 1, 3 - d i e n e H_{2} C 1 = C 2 H - C 3 H = C 4 H_{2} \Rightarrow

It is a conjugated diene. 5. Prop-1, 2-diene is a cumulative diene. Hence, statements 3 and 5 are correct.

1, 2

2, 3

4, 5

2, 5

3, 5