Question

Which of the following is optically active ?
H H
| |
(a) CH₃ — C — C — C₂H₅ (b) CH₃ — CHOH — CH₃
| |
OH OH
Br
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(c) CH₃ — C — C— COOH (d) CH₃ — CH₂ — C = O
|| | |
O Br OH

Answer 1

Answer:

number di is the answer

Answer 2

Optically active compound is :

H H

| |

(a) CH₃ — C — C — C₂H₅

| |

OH OH

OH

|

(b) CH₃ — C— CH₃

|

H

Br

|

(c) CH₃ — C — C— COOH

|| |

O Br

(d) CH₃ — CH₂ — C = O

|

OH

1. (a) do not have axis of symmetry between C2 and C3 carbon. Hence it is optically active.

2. (b) C2 have two substituents same attached to it i.e CH₃. Hence, optically inactive.

3. (c) C2 have two substituents same attached to it i.e Br. Hence, optically inactive.

4. (d) contains plane of symmetry. Hence, optically inactive.