1. The names of the various compounds shown above are:
A. 4-chlorobutanal
B. 4-bromo-3-nitrohexanal
C. 3-ethylpentanal
2. Tollen's test indicates the presence aldehyde (option A)
How to name the compound?
The naming of compound has been defined by the IUPAC standard which follows certain principles. The name of the compounds shown in the question can be obtained as follow:
For A:
- The function group in the compound is CHO. Thus, the compound is an alkanal
- The longest chain is 4. Thus, the parent name is butanal
- The substituent in the compound is Cl and it is located at carbon 4
- Please be reminded that numbering starts from the functional group
Thus, the name is 4-chlorobutanal
For B:
- The function group in the compound is CHO. Thus, the compound is an alkanal
- The longest chain is 6. Thus, the parent name is hexanal
- The substituents in the compound are bromo, Br and nitro, NO₂. The Br is located at carbon 4 and the NO₂ is located at carbon 3
Thus, the name is 4-bromo-3-nitrohexanal
For C:
- The function group in the compound is CHO. Thus, the compound is an alkanal
- The longest chain is 5. Thus, the parent name is pentanal
- The substituent in the compound ethyl, CH₂CH₃ and it is located at carbon 3
Thus, the name is 3-ethylpentanal
2. Tollen's test is a special test for organic compound to distinguish aldehydes from ketones.
Thus, aldehyde will give a positive test to tollen's reagent.
Therefore, the correct answer is option A