In polyenes that contain differently substitu | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The molecule is limonene,which has two $(C=C)$ double bonds: one is a trisubstituted double bond inside the ring,and the other is a disubstituted

Vedclass · Accepted Answer

$1-$methyl$-4-$isopropylcyclohex$-1-$ene

Vedclass · Answer

(B) The molecule is limonene,which has two $(C=C)$ double bonds: one is a trisubstituted double bond inside the ring,and the other is a disubstituted terminal double bond (exocyclic). Catalytic hydrogenation using $PtO_2$ is sensitive to the steric hindrance and the stability of the alkene. The less substituted (and thus less stable) double bond is more reactive towards hydrogenation. The terminal exocyclic double bond is less substituted and more accessible than the endocyclic trisubstituted double bond. Therefore,the terminal double bond is reduced first to form $1$-methyl-$4$-isopropylcyclohex-$1$-ene.

In polyenes that contain differently substituted $(C=C)$ double bonds,it is possible to hydrogenate chemoselectively one $(C=C)$ double bond. The product of the reaction of limonene with one mole of $H_2$ in the presence of $PtO_2$ is:

Similar Questions

Identify the product in the following reaction.

$But-1-ene$ reacts with diborane to give '$X$'. On oxidation of '$X$' with $H_2O_2$ in the presence of aqueous $NaOH$,it forms alcohol '$Y$'. What are '$X$' and '$Y$'?

$CH_3-CH=CH_2 + NOCl \rightarrow P$
Identify the adduct.

The reaction $R-CH=CH_2 \xrightarrow{Na/NH_3, C_2H_5OH} R-CH_2CH_3$ is known as:

The alkene that gives only acetone upon ozonolysis is .......

Vedclass Test Series

Exam Paper Generator

Online Exam Module