Question:

IUPAC name of the following is $CH_2=CH-CH_2CH_2-C \equiv CH$

Updated On: Jul 12, 2022

$1,5$ -hexenyne
$1$ -hexene- $5$ -yne
$1$ -hexyne- $5$ -ene
$1,5$ -hexynene

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The Correct Option is B

Solution and Explanation

The double bond gets priority over triple bond. So, the IUPAC name of $ _{CH_2}^{ \, \, \, \, 1} \, _{=CH}^{ \, \, \, \, 2} \, _{-CH_2}^{ \, \, \, \, 3} \, _{-CH_2}^{ \, \, \, \, 4} \, _{-C}^{ \, \, \, \, 5} \, _{\equiv CH}^{ \, \, \, \, 6}$ hex-l-en-5-yne or l-hexene-5-yne

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Concepts Used:

Organic Chemistry – Some Basic Principles and Techniques - Reaction Mechanism

SN1 Reaction Mechanism:

S_N¹ reaction mechanism takes place by following three steps –

Formation of carbocation
Attack of nucleophile
Deprotonation

SN2 Reaction Mechanism:

The SN2 reaction mechanism involves the nucleophilic substitution reaction of the leaving group (which generally consists of halide groups or other electron-withdrawing groups) with a nucleophile in a given organic compound.

Electrophilic Aromatic Substitution Reaction Mechanism:

The mechanism of an electrophilic aromatic substitution reaction contains three main components which are:

A new sigma bond from C=C is formed during the reaction in the arene nucleophile.
Due to the breaking of the C-H sigma bond, a proton is removed.
The C=C bond is reformed and it restores the aromaticity of the compound.

Electrophilic Substitution Reaction Mechanism:

The electrophilic substitution reaction mechanism is composed of three steps, which will be discussed more below.

Electrophile Generation
Carbocation Formation
Proton Removal

List-I (Conversion)		List-II (Shape/geometry)
(A)	1 mol of H₂O to O₂	(I)	3F
(B)	1 mol of MnO^-₄ to Mn²⁺	(II)	2F
(C)	1.5 mol of Ca from molten CaCl₂	(III)	1F
(D)	1 mol of FeO to Fe₂O₃	(IV)	5F

IUPAC name of the following is CH2=CH−CH2CH2−C≡CH CH_2=CH-CH_2CH_2-C \equiv CH CH2​=CH−CH2​CH2​−C≡CH