Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 2: Problem 26

A hydrocarbon having only primary hydrogens is (a) Cyclohexane (b) 2-methylpropane (c) 2, 3 dimethyl but-2-ene (d) \(\mathrm{n}\) - butane

Short Answer

Expert verified
a) Cyclohexane b) 2-methylpropane c) 2, 3 dimethyl but-2-ene d) \(\mathrm{n}\) - butane Answer: b) 2-methylpropane

Step by step solution

01

Choice (a): Cyclohexane

Cyclohexane is a ring structure containing six carbon atoms attached to form a hexagon. Each carbon atom is bonded to two hydrogen atoms. However, each carbon atom is also bonded to two other carbon atoms (in a ring), which makes it a secondary carbon, and therefore, its hydrogens are not primary.
02

Choice (b): 2-methylpropane

2-methylpropane has the following structure: \(\mathrm{CH_3-CH(CH_3)_2}\). Here, the central carbon atom is called a tertiary carbon because it is bonded to three other carbon atoms. The other three carbon atoms are primary carbons because they are bonded to only one other carbon atom. So, 2-methylpropane has only primary hydrogens attached to its primary carbons, making it a possible answer.
03

Choice (c): 2, 3 dimethyl but-2-ene

2, 3 dimethyl but-2-ene has the following structure: \(\mathrm{CH_3-C(CH_3)=CH-C(CH_3)_2}\). In this compound, the carbon atom with the double bond (C=C) is called a quaternary carbon. It is bonded to three other carbons, making it a tertiary carbon, while the other three carbons are bonded to only one other carbon atom (primary carbons). The hydrogens on the primary carbons are primary hydrogens, but the quaternary carbon has no hydrogens attached, indicating that this compound doesn't have only primary hydrogens.
04

Choice (d): \(\mathrm{n}\) - butane

\(\mathrm{n}\) -butane has the following structure: \(\mathrm{CH_3-CH_2-CH_2-CH_3}\). The carbon atoms at the ends (first and fourth positions) are attached to only one other carbon atom, making them primary carbons, while the other two carbon atoms in the middle are attached to two other carbon atoms making them secondary carbons. The two primary carbons have three primary hydrogens attached to them while the two secondary carbons have two secondary hydrogens attached to them. Thus, this compound doesn't have only primary hydrogens. Based on all provided choices, the only compound that has only primary hydrogens is: 2-methylpropane (choice b).

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Reaction of trans-2-phenyl-1-bromocyclohexane with hot alcoholic \(\mathrm{NaOH}\) gives (a) 3 -phenylcyclohexene (b) 1 -phenylcyclohexene (c) 2 -bromophenyl cyclohexane (d) 2 -phenyl cyclohexanol

The number of structural and stereoisomers of a bromo compound \(\mathrm{C}_{5} \mathrm{H}_{9} \mathrm{Br}\) formed by the addition of \(\mathrm{HBr}\) to pent- 2 yne are respectively (a) 4 and 2 (b) 1 and 2 (c) 2 and 4 (d) 2 and 1

Which of the following compounds can exhibit geometrical isomerism? (a) \(\mathrm{IBrC}=\mathrm{CFCI}\) (b) Cinnamic acid (c) Benzophenone oxime (d)

Identify the correct statements among the following (a) Chlorination of \(\mathrm{n}\) -butane involves the attack by a free radical. (b) 2,3-Dimethylbutane can form only two monochloro derivatives (c) Between \(\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{3}\) (I) and \(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{C} \equiv \mathrm{CH}\) (II), only (II) will react with \(\mathrm{CH}_{3} \mathrm{MgI}\). (d) When a mixture of ethane, ethylene and ethyne is passed into a solution of ammoniacal \(\mathrm{AgNO}_{3}\), the gases bubbling out will be a mixture of ethane and ethylene

An ester on hydrolysis gave an acid which on Kolbe's electrolysis gave ethane. The ester is (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COO} \mathrm{CH}_{3}\) (b) (c) \(\mathrm{CH}_{3} \mathrm{COO} \mathrm{C}_{2} \mathrm{H}_{5}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{COO} \mathrm{C}_{2} \mathrm{H}_{5}\)
See all solutions

Recommended explanations on Chemistry Textbooks

Chemical Analysis

Read Explanation

Chemistry Branches

Read Explanation

Inorganic Chemistry

Read Explanation

Nuclear Chemistry

Read Explanation

Physical Chemistry

Read Explanation

Kinetics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free