NEET Biology Complete Course by Moniba Madam - Watch Full Playlist

Test Index

Class 11 NEET Chemistry Organic Chemistry Some Basic Principles And Techniques Part 1

Question : 85 of 100

Marks: +1, -0

2-Methyl-2-butene will be represented as

(1992)

$\mathrm{CH}_3-\overset{\overset{\mathrm{CH}_3}{\vert}}{\mathrm{C}}\mathrm{H}-\mathrm{CH}_2\mathrm{CH}_3$
$\mathrm{CH}_3-\underset{\underset{\mathrm{CH}_3}{\vert}}{\mathrm{C}}=\mathrm{CH}-\mathrm{CH}_3$
$\mathrm{CH}_3-\mathrm{CH}_2-\underset{\underset{\mathrm{CH}_3}{\vert}}{\mathrm{C}}=\mathrm{CH}_2$
$\mathrm{CH}_3-\underset{\underset{\mathrm{CH}_3}{\vert}}{\mathrm{C}}\mathrm{H}-\mathrm{CH}=\mathrm{CH}_2$

Validate

Solution:

Concept: IUPAC naming — identify the longest chain with the double bond, number from the end closest to the double bond, and place substituents accordingly.

Explanation:

2-Methyl-2-butene means:
Parent chain: butene (4 carbons with a double bond)
Double bond at position 2** (between C2 and C3)
Methyl group at position 2**

Building the structure:

\mathrm{C_1H_3} - \underset{\underset{\mathrm{CH_3}}{\vert}}{\mathrm{C_2}} = \mathrm{C_3H} - \mathrm{C_4H_3}

C1: $\mathrm{CH_3}$
C2: has the double bond and a $\mathrm{CH_3}$ substituent
C3: $\mathrm{CH}=$ (double bond here)
C4: $\mathrm{CH_3}$

This gives:

\mathrm{CH_3} - \underset{\underset{\mathrm{CH_3}}{\vert}}{\mathrm{C}} = \mathrm{CH} - \mathrm{CH_3}

Answer: Option B —

\mathrm{CH_3}-\underset{\underset{\mathrm{CH_3}}{\vert}}{\mathrm{C}}=\mathrm{CH}-\mathrm{CH_3}

Go to Question:

Prev Question

Next Question