Questions

# The Newmann’s structure of a compound is given as In how many combinations of X and Y the gauche form is more stable than anti? $\begin{array}{l}\left(\mathrm{i}\right)\text{\hspace{0.17em}}{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-,\mathrm{OH}\left(\mathrm{ii}\right)\text{\hspace{0.17em}}\mathrm{OH},\mathrm{F}\left(\mathrm{iii}\right)\text{\hspace{0.17em}}{\mathrm{NH}}_{2},\mathrm{OH}\left(\mathrm{iv}\right)\text{\hspace{0.17em}}\mathrm{OH},{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-\text{\hspace{0.17em}}\left(\mathrm{v}\right)\text{\hspace{0.17em}}\mathrm{F},\text{\hspace{0.17em}}{\mathrm{NH}}_{2}\\ \left(\mathrm{vi}\right)\text{\hspace{0.17em}}{\mathrm{NH}}_{3},{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-\left(\mathrm{vii}\right)\text{\hspace{0.17em}}\mathrm{F},{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-\left(\mathrm{viii}\right)\text{\hspace{0.17em}}{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-,{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-\text{\hspace{0.17em}}\left(\mathrm{ix}\right)\text{\hspace{0.17em}}\mathrm{H},\mathrm{H}\end{array}$

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Gauch form is more stable than anti when hydrogen bonding is possible between the groups