Email: bbcnoun@gmail.com
Whatsapp: 08131667008


CHM305


Question: Under the influence of dilute base or dilute acid, two molecules of an aldelyde may combine to form a ------------------------------------------------.
Answer: [C] β-hydroxy aldehyde

Question: C = O, -COOH, -COOR and –CN groups are ------------------------------------------------------ and therefore would be expected to deactivate a carbon-carbon double bond toward electrophilic addition.
Answer: [C] powerful electron withdrawing groups

Question: Hydroxylamine in the form of one of its more stable salts, (hydroxylamine hydrochloride HONH+ 4Cl-) reacts with aldehydes and ketones to form --------------------
Answer: [B] Oximes

Question: If a nucleophile add to the β – carbon of α,β – unsaturatedaldehydes or ketones then it is a ------------------------------------------ or a conjugate addition.
Answer: [D] 1,4 – nucleophilic addition

Question: If a suitable aldehyde is treated with a concentrated aqueous solution of an alkali at room temperature, it yield the appropriate salt of the carboxylic acid and an alcohol, the reaction is called-----------
Answer: [C] Cannizaro Reaction

Question: The carbonyl group of α,β – unsaturated aldehydes and ketones consists of a nucleophilic oxygen and ----------------------- carbon.
Answer: [D] an electrophilic

Question: Fehling’s solution is a mixture of equal volume of copper(II)tetraoxosulphate(VI)solution (Fehling solution A) and sodium hydroxide and ---------------------------------------------- (Fehling’s solution B).
Answer: [D] potassium sodium tartarate solution

Question: α,β – unsaturated aldehydes and ketones also have another ------------------------------- carbon – the β – carbon.
Answer: [A] electrophilic

Question: The aldehydes are oxidized by Tollen’s reagent in a ------------------------------------------ test
Answer: [A] silver mirror

Question: When ethyl acetate is treated with sodium ethoxide and the resulting mixture is acidified, it gives ethyl-β- ketobutyrate(ethyl 3-oxobutanoate), generally known as ------------------------------------
Answer: [B] acetoacetic ester