Question

1,1 dimethyl cyclohexane is optically inactive because
(a) Presence of centre of symmetry
(b) Presence of a plane of symmetry
(c) Presence of identical substituents on same carbon atom
(d) None of these.​

Answer 1

Answer:

b) presence of a plane of symmetry

Answer 2

Answer:

1, 1 dimethyl cyclohexane is optically in active due to a) presence of centre of symmetry.

Explanation:

What does it mean to be optically inactive:

• Optical inactivity refers to a compound that is incapable of optical rotation.
• Pure achiral molecules have no optical activity.
• Chloroethane, for example, is achiral and does not rotate plane-polarized light.

What is centre of symmetry:

• It is a point within a molecule from which lines drawn to opposite direction meet similar points at exactly the same direction and distance.
• A centre of symmetry is a place in space where any group on a molecule can be reflected back through it an identical distance but in the opposite direction, resulting in the discovery of an equivalent group.