Which of the following compounds will give silver mirror with ammoniacal silver nitrate?A. Formic acidB. FormaldehydeC. BenzaldehydeD. AcetoneChoose the correct answer from the options given below :JEE Main 2024 (09 Apr Shift 2)AA, B and C onlyBC and D onlyCB and C onlyDA only
Question
Which of the following compounds will give silver mirror with ammoniacal silver nitrate?A. Formic acidB. FormaldehydeC. BenzaldehydeD. AcetoneChoose the correct answer from the options given below :JEE Main 2024 (09 Apr Shift 2)AA, B and C onlyBC and D onlyCB and C onlyDA only
Solution
The Tollens' test, also known as the silver mirror test, is used to determine whether a substance is an aldehyde or a ketone. It involves the reaction of the substance with ammoniacal silver nitrate. If the substance is an aldehyde, it will reduce the silver ions to metallic silver, forming a silver mirror on the inside of the test tube.
A. Formic acid (HCOOH) - This is not an aldehyde or a ketone, but it can still reduce silver ions to metallic silver, so it will give a positive result.
B. Formaldehyde (HCHO) - This is an aldehyde, so it will give a positive result.
C. Benzaldehyde (C6H5CHO) - This is also an aldehyde, so it will give a positive result.
D. Acetone (CH3COCH3) - This is a ketone, and ketones do not give a positive Tollens' test.
So, the correct answer is A, B and C only.
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