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  4. The major product [R] in the following sequence of reactions is :- <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/fd6492b22fc3e9526efc1d074895324f-.png />

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Q. The major product $[R] $ in the following sequence of reactions is :-
image

JEE MainJEE Main 2020Aldehydes Ketones and Carboxylic Acids

Solution:

image

Now :- (i) $HgSO _{4} / dil \cdot H _{2} SO _{4}$

(ii) $NaBH _{4}$

is convert triple bond into ketone and formed ketone is reduced by $NaBH _{4}$ and convert into Alcohol.