Ncert Exercises & Solutions

Which of the following alkenes undergoes ozonolysis to give a mixture of ketones only?

(a). ${CH}_{3} - CH = CH - {CH}_{3}$

(b).

(c).

(d).
1. (c) Only
2. (c) and (d)
3. (a) and (d)
4. (d) only

(3, 4)

Alkenes which have two substituents on each carbon atom of the double bond, give mixture of ketones on ozonolysis. Thus, option (3) and (4) give mixture of ketones.

On the other hand, alkenes (a) and (b) give a mixture of two aldehydes.

{CH}_{3} CH = CH - {CH}_{3} \to_{Zn / H_{2} O}^{O_{3} / {CCl}_{4}, 196 K} {CH}_{3} CH = O + O = {CHCH}_{3}

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