Which isomer of hexane has only two different sets of structurally equivalent hydrogen atoms?

Question

Which isomer of hexane has only two different sets of structurally equivalent hydrogen atoms? (A) 2,2-dimethylbutane (B) 2-methylpentane (C) 3-methylpentane (D) 2,3-dimethylbutane

Tardigrade Admin · Accepted Answer

[a] underset text2,2- dimethyl butaneCH3CH2 - underset overset|CH3 overset underset|CH3C - CH3 [b] underset text2 - methyl pentaneCH3CH2CH2 - overset underset|CH3CH - CH3 [c] underset text3 - methylpentaneCH3CH2 - overset underset|CH3CH - CH2CH3 [d]

Q. Which isomer of hexane has only two different sets of structurally equivalent hydrogen atoms?

2,2-dimethylbutane

2-methylpentane

3-methylpentane

2,3-dimethylbutane

[a] $2,2- dimethyl butane C H_{3} C H_{2} - C ∣ H_{3} C ∣ C H_{3} - C H_{3}$
[b] $2 - methyl pentane C H_{3} C H_{2} C H_{2} - C H ∣ C H_{3} - C H_{3}$
[c] $3 - methylpentane C H_{3} C H_{2} - C H ∣ C H_{3} - C H_{2} C H_{3}$
[d]

Q. Which isomer of hexane has only two different sets of structurally equivalent hydrogen atoms?

2,2-dimethylbutane

2-methylpentane

3-methylpentane

2,3-dimethylbutane

[a] 2,2- dimethyl butaneCH3​CH2​−C∣H3​C∣C​H3​​−CH3​​ [b] 2 - methyl pentaneCH3​CH2​CH2​−CH∣C​H3​−CH3​​ [c] 3 - methylpentaneCH3​CH2​−CH∣C​H3​−CH2​CH3​​ [d]

[a] $2,2- dimethyl butane C H_{3} C H_{2} - C ∣ H_{3} C ∣ C H_{3} - C H_{3}$
[b] $2 - methyl pentane C H_{3} C H_{2} C H_{2} - C H ∣ C H_{3} - C H_{3}$
[c] $3 - methylpentane C H_{3} C H_{2} - C H ∣ C H_{3} - C H_{2} C H_{3}$
[d]