Chemistry 131 Name I. Use the compounds below to answer the questions that follo

Question

Chemistry 131 Name I. Use the compounds below to answer the questions that follow. Some of these reagents were used in lab and some are new. List all that apply. You may use them more than once, or not at all 0 3-methyl-2,3-pentanediol A) Which compound(s) will react with NaBH4!? B) Which compound(s) will produce a black sooty product by burning? C) Which compound(s) will produce an orange solution with K2Cr204? D) Which compound(s) will produce a red precipitate with CuSo4(aq)? E) Which compound(s) will produce a clear solution with Br2 in CH2Cl2? 2. The compound 2-isopropylpentanal reacts completely with 2,2-propanediol in the presence of acid. Draw the overall reaction including the structure(s) of the product(s). Draw all the molecules as line-bond structures

Explanation / Answer

A) MOLECULE A

REASON NaBH4 reduces the carbonyl carbons like aldehyde and ketone to alcohols

B) MOLECULE A

REASON aromatic carbons give black shooty flame due to more carbon content

C) MOLECULE BDE

k2Cr2O4 oxidises primary alcohols and aldehydes to carboxylic acids

secondary alcohols to ketones

MOLECULE B D has aldehyde so oxidises to carboxylic acids

molecule E has secondary alcohol so converted to ketones

D) MOLECULE B D

aldehydes give the red precipitate with cuso4

E) MOLECULE A C

BROMINE TEST IS TO IDENTIFY PRESENCE OF DOUBLE BOND OR TRIPLE BOND

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