Question

Multiple choice questions I. Which ONE of the following compounds is an isolated diene? a) 4-methyl-13-heptadiene b) 5-methyl-2,6-heptadiene c) 2-methyl-2.4-heptadiene d) 5-methyl-2.3-heptadiene e) 13-cyclohexadiene 2. Which ONE of the following compounds will liberate the largest heat upon hydrogenation? 3. How many of the molecules below are aromatic? Identify and count. 4. How many electrons are participating in aromaticity? :N H a) 2 b) 4 c)6 d) 8 Which of the following sets of substituents are all activating groups in electrophilic aromatic substiution lowing sets of substituents are all activating groups in electrophilic aromatic substitution reactions? a. CHs, NH2, OCH c.CI, NH,. CH, b. CI, CN, NO d. CH,, OCH,, COCH, 6. What is the major organic product obtained from the following reaction? Cl HyC AICla

Answer 1

Ans 1 : 5-methyl-2,6-heptadiene

The isolated dienes are also called as unconjugated dienes. In these alkenes , the double bonds are seperated by two or more single bonds. These alkenes are less stable than conjugated dienes.

Here the double bonds are present on 2nd and 6th positions , and 3 single bonds are present in between them.