Which of the following alkynes,upon treatment | vedclass

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

Question

(D) The hydrogenation of an alkyne with $2 \ mole$ of $H_2$ in the presence of $Pt$ catalyst results in the corresponding alkane.For a compound to be

Vedclass · Accepted Answer

None of the above

Vedclass · Answer

(D) The hydrogenation of an alkyne with $2 \ mole$ of $H_2$ in the presence of $Pt$ catalyst results in the corresponding alkane.For a compound to be optically active,it must contain a chiral center (a carbon atom bonded to four different groups).Let's analyze the products:$A$) $3-$Methyl-$1-$pentyne $(CH_3CH_2CH(CH_3)C \equiv CH)$ on hydrogenation gives $3-$methylpentane $(CH_3CH_2CH(CH_3)CH_2CH_3)$. This molecule has a chiral center at $C-3$ $(CH_3CH_2-CH(CH_3)-CH_2CH_3)$,so it is optically active.$B$) $4-$Methyl-$1-$hexyne $(CH_3CH_2CH(CH_3)CH_2C \equiv CH)$ on hydrogenation gives $3-$methylhexane $(CH_3CH_2CH(CH_3)CH_2CH_2CH_3)$. This molecule has a chiral center at $C-3$,so it is optically active.$C$) $3-$Methyl-$1-$heptyne $(CH_3CH_2CH_2CH_2CH(CH_3)C \equiv CH)$ on hydrogenation gives $3-$methylheptane $(CH_3CH_2CH_2CH_2CH(CH_3)CH_2CH_3)$. This molecule has a chiral center at $C-3$,so it is optically active.Since all the given options result in optically active alkanes,the correct answer is $D$.

Which of the following alkynes,upon treatment with $H_2$ $(2 \ mole)$ / $Pt$,gives an optically inactive compound?

Similar Questions

The reagent which is used to distinguish between propene and propyne is

In the given reaction $x$ is:
$CH_3 - C \equiv CH$ $\xrightarrow{Excess\ HCl} (A)$ $\xrightarrow{H_2O/OH^{-}} (x)$

In the reaction $HC \equiv CH + 2AgNO_3 \xrightarrow{NH_4OH} X + 2NH_4NO_3 + 2H_2O$,'$X$' is:

Maximum bond energy of $C-H$ bonds is found in the compound:

$HC \equiv CH$ $\xrightarrow[20\% \ H_2SO_4]{1\% \ HgSO_4} A$ $\xrightarrow{CH_3MgX} B$ $\xrightarrow{[O]} ?$
What is the final product of the above reaction sequence?

Vedclass Test Series

Exam Paper Generator

Online Exam Module