Question 3 Not yet answered Marked out of 1.00000 P Flag question You have an unknown compound. It yields a positive permanganate test, a negative bromine test, a positive iodoform test, a postive, but slow (5 minutes) Lucas test. Which of the following answers is fully consistent with these results Select one: O a. aldehyde b. alkene O c. a secondary alcohol with the structure R-CH(OH)-CH2-CH R is a saturated hydrocarbon substituent. O d. a secondary alcohol with the structure R-CH(OH)-CH3 Ris a saturated hydrocarbon substituent. O e. alkyl halide O O f. a tertiary alcohol g. alkyne h. a primary alcohol Previous page Finish attempt.
Solution
d) will give positive permanganate test,negative bromine test,a positive iodoform test and slow lucas test.
d) a secondary alcohol with the structure R-CH(OH)CH 3 R is a saturated hydrocarbon is fully consistent with all the results.
also secondary alcohol gives slow lucas test, positive permanganate test and negative bromine test.
a secondary alcohol with the structure R-CH(OH)CH 3 with adjacent alkyl group (CH 3 ) gives positive iodoform test .
Therefore, not true for R-CH(OH)CH 2 CH 3 types of groups.
positive permanganate and bromine test is for alkene and alkyne systems. So negative bromine test for alkenes does not hold true.
Primary alcohol show immediate lucas test so primary alcohol also rules out.
Tertiary alcohol show turbidity on heating for lucas test so this option also rules out
aldehyde only ethanal gives positive iodoform test.not true for all the aldehydes.
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Question 3 Not yet answered Marked out of 1-00000 P Flag question You.docx
1. Question 3 Not yet answered Marked out of 1.00000 P Flag question You have an unknown
compound. It yields a positive permanganate test, a negative bromine test, a positive iodoform
test, a postive, but slow (5 minutes) Lucas test. Which of the following answers is fully
consistent with these results Select one: O a. aldehyde b. alkene O c. a secondary alcohol with
the structure R-CH(OH)-CH2-CH R is a saturated hydrocarbon substituent. O d. a secondary
alcohol with the structure R-CH(OH)-CH3 Ris a saturated hydrocarbon substituent. O e. alkyl
halide O O f. a tertiary alcohol g. alkyne h. a primary alcohol Previous page Finish attempt.
Solution
d) will give positive permanganate test,negative bromine test,a positive iodoform test and slow
lucas test.
d) a secondary alcohol with the structure R-CH(OH)CH 3 R is a saturated hydrocarbon is
fully consistent with all the results.
also secondary alcohol gives slow lucas test, positive permanganate test and negative bromine
test.
a secondary alcohol with the structure R-CH(OH)CH 3 with adjacent alkyl group (CH 3 ) gives
positive iodoform test .
Therefore, not true for R-CH(OH)CH 2 CH 3 types of groups.
positive permanganate and bromine test is for alkene and alkyne systems. So negative bromine
test for alkenes does not hold true.
Primary alcohol show immediate lucas test so primary alcohol also rules out.
Tertiary alcohol show turbidity on heating for lucas test so this option also rules out
aldehyde only ethanal gives positive iodoform test.not true for all the aldehydes.
