JEE Main · 2021 · 27 Jul 2021 · Shift 2 · General Organic Chemistry

The dihedral angle in staggered form the Newman projection of

1, 1, 1, -

Trichloro ethane is
____ degree. (Round off to the Nearest Integer).

Answer: 60

Solution

Looking along the

C - C

bond of

CC l_{3} - C H_{3}

, the Newman projection shows three front bonds

12 0^{\circ}

apart and three rear bonds also

12 0^{\circ}

apart. The staggered conformation is the one in which each rear bond lies exactly midway between two front bonds, since that arrangement places the bulky groups as far apart as possible. The torsion angle between a front bond and its nearest rear bond is therefore half of

12 0^{\circ}

, that is

60

degrees.

JEE Main · 2021 · 27 Jul 2021 · Shift 2 · Integer answer

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