Ncert Exercises & Solutions

Question 13.21:-

Write structures of all the alkenes which on hydrogenation give
2-methyl butane.

The basic skeleton of 2-methyl butane is shown below:

C^{1} - {\underset{\overset{|}{C}}{C}}^{2} - C^{3} - C^{4}

On the basis of this structure, various alkenes that will give 2-methyl butane on hydrogenation are:

(a)

H_{3} C - \underset{\overset{|}{C H_{3}}}{C H} - C H = C H_{2}

(b)

C H_{2} = \overset{\underset{|}{C H_{3}}}{C} - C H - C H_{3}

(c)

C H_{2} = \underset{\overset{|}{C H_{3}}}{C} - C H - C H_{3}