Ozonolysis of 2,3-dimethyl-1-butene followed by reduction with zinc and water gives

methanal and 3-methyl-2-butanone

The correct answer is option 3. methanal and 3-methyl-2-butanone.

Ozonolysis is a process where an alkene is cleaved by ozone \((O_3)\) to form carbonyl compounds. The reaction typically involves the formation of an ozonide intermediate, which is then reduced (commonly using zinc and water) to yield aldehydes or ketones.

Structure of 2,3-Dimethyl-1-butene:

Ozonolysis of 2,3-Dimethyl-1-butene:

When 2,3-dimethyl-1-butene undergoes ozonolysis, the double bond between the second and third carbon atoms is cleaved, resulting in the formation of two products. Each carbon atom involved in the double bond gets an oxygen, forming carbonyl compounds.

The ozonolysis products are therefore methanal and 3-methyl-2-butanone.