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Chapter 1: Problem 91

Which of the following is an isomer of 2, 2 -dimethyl propane? (a) Neopentane (b) 2-Methyl butane (c) Cyclopentane (d) Methyl cyclobutane

Short Answer

Expert verified
(a) Neopentane (b) 2-Methyl butane (c) Cyclopentane (d) Methyl cyclobutane Answer: (a) Neopentane

Step by step solution

01

Determine the molecular formula of 2,2-dimethyl propane

To determine the molecular formula of 2,2-dimethyl propane, we will first understand its structure. Propane has three carbon atoms, and 2,2-dimethyl propane has two additional methyl groups (-CH3) attached to the second carbon atom. Therefore, the molecular formula for 2,2-dimethyl propane is: C (3 carbons) + 6 (6 hydrogen atoms from the two methyl groups) + 8 (8 hydrogen atoms from the three carbons in propane) = C5H12
02

Analyze the given options and compare molecular formulas

Here are the molecular formulas for each option: (a) Neopentane: C5H12 (b) 2-Methyl butane: C5H12 (c) Cyclopentane: C5H10 (d) Methyl cyclobutane: C5H10 Now we can see that options (a) and (b) have the same molecular formula as 2,2-dimethyl propane, so one of them is the correct answer. Next, we'll analyze their structures.
03

Analyze structures and determine the isomer

Let's analyze the structures for options (a) and (b), and compare them with 2,2-dimethyl propane: - 2,2-dimethyl propane: A central carbon atom bonded to two CH3 groups and two hydrogen atoms (H) - (a) Neopentane: Same structure as 2,2-dimethyl propane - (b) 2-Methyl butane: A linear structure with one methyl group (-CH3) attached to the second carbon atom of the butane chain As the structure of option (a) Neopentane matches the structure of 2,2-dimethyl propane and has the same molecular formula, Neopentane is an isomer of 2,2-dimethyl propane. Therefore, the correct answer is (a) Neopentane.

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Most popular questions from this chapter

The specific rotation of a pure optically active compound is \(+12^{\circ} .\) The specific rotation of the sample in a reaction with \(20 \%\) racemization and \(80 \%\) retension of configuration will be (a) \(+12^{\circ}\) (b) \(-12^{\circ}\) (c) \(+9.6^{\circ}\) (d) \(-2.4^{\circ}\)

Which of the following carbanions is most stable? (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}^{-}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CH}_{2}^{-}\) (d) \(\mathrm{ClH}_{2} \mathrm{C}-\overline{\mathrm{C}}\left(\mathrm{CH}_{3}\right)_{2}\)

Which of the following does not exhibit tautomerism?

The IUPAC name of the compound given is (a) \(2,2-\) diethyl propane \(-1,3-\) dialdehyde (b) 3,3 - diethyl pentane- 1,5 -dial (c) \(2,2-\) diethyl propane \(-1,3-\) dial (d) 3,3 -dimethyl keto pentane

A set which contains an electrophile, a Lewis base and a species containing unpaired electrons among the following is (a) \(\mathrm{Cl}^{-}, \mathrm{AlCl}_{3}\) and \(\mathrm{H}_{2}\) (b) \(\mathrm{SO}_{3},\left(\mathrm{CH}_{3}\right)_{2} \mathrm{O}\), triplet carbene (c) \(\mathrm{Cl}^{-}, \mathrm{HCl}\) and singlet carbene
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