Question

above Gauche form is stable when Z is :-
-F
-ОН
-OCH
All of these


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Answer 1

Answer:

Explanation:

if internal acid base are present then it is unstable

Answer 2

Answer:

Gauche conformation is stable when Z= -F and -OH group .

Explanation:

• When Z is  fluorine or -OH. In that case hydrogen bonding is possible between the hydrogen of -OH group and fluorine as well as between two diol groups present at 60° w.r.t. each other.
• But in case of -OCH₃, due to presence of bulky methyl group. Hydrogen bonding may not be possible.

Therefore, the gauche conformer more stable when fluorine or -OH group present.