What can be said with certainty if an alcohol has a specific rotation of + 6.07?

Question

What can be said with certainty if an alcohol has a specific rotation of + 6.07? (A) It is Levorotatory (B) It is dextrorotatory (C) It is optically active (D) It has (R) configuration (E) B and C arc both correct Carbocation are frequent intermediates in acidic reactions of alkenes, alcohols, etc. What do carbocations usually do? They may: A. rearrange to a more stable carbocation. B. lose a proton to form an alkene. C. combine with a nucleophile. D. react with an alkene to form a larger carbocation. E. do all of the above.

Explanation / Answer

28) What can be said with certainty if an alcohol has a specific rotation of +6.0

Compounds which rotate light clockwise are said to be dextrorotary,
and correspond with positive specific rotation values, while compounds which rotate light counterclockwise are said to be levorotary and correspond with negative values. If a compound is able to rotate plane-polarized light, it is said to be “optically active”.

We have alcohol specific rotation is +6.0, so it is dextrorotary and also it is optically active. Therefore, given alcohol is dextrorotary and optically active.

Answer: E (B and C are both correct)

29) carbocations are frequently intermediates in acidic reactions of alkenes, alcohols etc. What do carbocations usually do?

Answer: E (do all of the above)

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