The number of different chain isomers for \( \text{C}_7\text{H}_{16} \) is ______.
Correct Answer: 9
Solution and Explanation
For a hydrocarbon with the molecular formula \( C_7H_{16} \), which is an alkane, we can determine the possible chain isomers by drawing all unique structures with the same molecular formula.
The chain isomers for \( C_7H_{16} \) are as follows:
Straight Chain (Heptane):
\[ \text{CH}_3 - \text{CH}_2 - \text{CH}_2 - \text{CH}_2 - \text{CH}_2 - \text{CH}_2 - \text{CH}_3 \]
Branched Chains (Various Isomers):
- 2-Methylhexane
- 3-Methylhexane
- 2,2-Dimethylpentane
- 2,3-Dimethylpentane
- 2,4-Dimethylpentane
- 3,3-Dimethylpentane
- 3-Ethylpentane
- 2,2,3-Trimethylbutane
Each of these structures represents a distinct arrangement of carbon atoms, satisfying the molecular formula \( C_7H_{16} \).
Conclusion:
There are a total of 9 different chain isomers for \( C_7H_{16} \).
Top Questions on Atomic Structure
- Energy and radius of first Bohr orbit of He$^+$ and Li$^2+$ are:
Given: $ R_H = 2.18 \times 10^{-18} \, \text{J}, a_0 = 52.9 \, \text{pm} $- NEET (UG) - 2025
- Chemistry
- Atomic Structure
- The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes n = 2 $\rightarrow$ n = 3 and n = 4 $\rightarrow$ n = 6 transitions, respectively, is:
- NEET (UG) - 2025
- Chemistry
- Atomic Structure
- The number of radial nodes present in 4f orbital is:
- CUET (PG) - 2025
- Chemistry
- Atomic Structure
- The effective nuclear charge (\( Z_{\text{eff}} \)) experienced by 4s electrons of Cu(29) is:
- CUET (PG) - 2025
- Chemistry
- Atomic Structure
- Which of the following is incorrect as per rules for Linear Combination of Atomic Orbitals (LCAO)?
- CUET (PG) - 2025
- Nano Science
- Atomic Structure
Questions Asked in JEE Main exam
- The number of points of discontinuity of the function $ f(x) = \left\lfloor \frac{x^2}{2} \right\rfloor - \left\lfloor \sqrt{x} \right\rfloor, \quad x \in [0, 4], $ where $ \left\lfloor \cdot \right\rfloor $ denotes the greatest integer function, is:
- JEE Main - 2025
- Functions
- If \[ \sum_{r=1}^{13} \frac{1}{\sin \frac{\pi}{4} + (r-1) \frac{\pi}{6}} \sin \frac{\pi}{4} + \frac{\pi}{6} = a \sqrt{3} + b, \quad a, b \in \mathbb{Z}, { then } a^2 + b^2 { is equal to:} \]
- JEE Main - 2025
- Trigonometry
- If the first term of an A.P. is 3 and the sum of its first four terms is equal to one-fifth of the sum of the next four terms, then the sum of the first 20 terms is equal to:
- JEE Main - 2025
- Arithmetic Progression
Let \( S = \left\{ m \in \mathbb{Z} : A^m + A^m = 3I - A^{-6} \right\} \), where
\[ A = \begin{bmatrix} 2 & -1 \\ 1 & 0 \end{bmatrix} \]Then \( n(S) \) is equal to ______.
- JEE Main - 2025
- Matrix Algebra
- Let \( a_1, a_2, a_3, \dots \) be a G.P. of increasing positive terms. If \( a_1 a_5 = 28 \) and \( a_2 + a_4 = 29 \), then the value of \( a_6 \) is equal to:
- JEE Main - 2025
- Sequences and Series