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51.

`0.5g` of hydrocarbone gave `0.9 g ` water on combustion . The percentage of carbon in hydrocarbon isA. `75.8`B. `80.0`C. `56.6`D. `28.6`

Answer» Correct Answer - b
`%` of `H=(2)/(18)xx(wt. of H_(2)O)/("wt. of organic compound" )xx100`
`=(2)/(18)xx(0.9)/(0.5)xx100=20%`
Since percentage of hydrogen is 20. Therefore , remaining is carbon `i.e., 80%`
Discussion
52.

Degree of unsaturation in isA. 6B. 8C. 7D. 10

Answer» Correct Answer - b
`implies` One double bond means degree of unsaturation `=1`
`implies` One triple bond means degree of unsaturation `=2`
`implies` One ring means degree of unsaturation `=2`
Discussion
53.

An organic compound containes `C=74.0%, H=8.65%` and `N=17.3%`. Its empirical formul aisA. `C_(5)H_(8)N`B. `C_(10)H_(12)N`C. `C_(5)H_(7)N`D. `C_(10)H_(14)N`

Answer» Correct Answer - C
`"Element No. of Mol es Simple Ration"`
`C=74" "74//12=6.1" "6.1//1.2=5.08 ` or `5`
`H=8.65" "8.65//1=8.65" "8.6//1.5=7.16` or `7`
`N=1.73" "1.3//14=1.2" "1.2//1.2=1` or `1`
Therefore Empirical formula `=C_(5)H_(7)N.`
Discussion
54.

`64g` of an organic compound contains `24 g ` of carbon, `8gm` of hydrogen and the rest oxygen. The empirical formula of the compound isA. `CH_(2)O`B. `C_(2)H_(4)O`C. `CH_(4)O`D. `C_(2)H_(8)O_(2)`

Answer» Correct Answer - C
`"Elements No. of moles Simpleratio"`
`C(24g)" "24//12=12" "1`
`H(8g)" "8//1=8" "4`
`O (32g)" "32//16=2" "1`
Empirical formula `=CH_(4)O`
Discussion
55.

For the detection of phosphorus, the organic compound after fustion with `Na_(2)O_(2)` is extracted with water, boiled with `HNO_(3)` and then ammonium molybdate is added to it. A yellow pppt. Is obtained which is due to the formation ofA. ammonium phosphateB. ammonim phosphomolybdateC. ferric phosphateD. disodium ammonium phosphate

Answer» Correct Answer - b
Ammonium phosphomolybdate.
Discussion
56.

`0.2595 g` of an organic substance in a quantitative analysis yielded `0.35 g` of the barium sulphate. The percentage of sulphur in the subtance isA. `18.52 g`B. `182.2 g`C. `17.5 g`D. `175.2 g`

Answer» Correct Answer - A
`%` of `S=(32)/(233)xx("wt. of "BaSO_(4))/("wt. of organic compound")xx100`
`=(32)/(233)xx(0.35)/(0.2595)xx100=18.52%g`
Discussion
57.

Ethyoxyethene is written as follows, `H_(2)C=CH-O-CH_(2)-CH_(3)`. The structure of `2-`Chloro`-1-`ethoxyethene `9` incorrect name `)` with correct numbering wil l beA. `H_(2)C=CH-O-overset(1)(C)H_(2)-overset(2)(C)H_(2)-Cl`B. `CH_(2)=CH-O-overset(1)underset(Cl)underset(|)CH-overset(2)(C)H_(3)`C. `H_(2)overset(2)(C)=-overset(1)underset(Cl)underset(|)C-O-CH_(2)-CH_(2)-Cl`D. `Cl=overset(1)(C)H=overset(2)(C)H-O-CH_(2)-CH_(3)`

Answer» Correct Answer - D
`2-`Chloro`-1-`ethoxyethene
`Cl-overset(1)(C)=overset(2)(C)-O-C-C`
correct name `1-`Chloro`-2-`ethoxyethene
Discussion
58.

The name of `CH_(3)CN` isA. AcetonitrileB. Methyl cynaideC. Ethane nitrileD. All of these

Answer» Correct Answer - d
Discussion
59.

In the qualitative analysis of nitrate a brown ring is formed due to the formation ofA. `NO_(2)`B. `FeSO_(4)NOH_(2)`C. `N_(2)O.FeSO_(4)`D. `FeSO_(4).NO`

Answer» Correct Answer - D
Nitrates on reaction with conc. `H_(2)SO_(4)` and `FeSO_(4)` give a brown ring due to formtion of `FeSO_(4).NO` or `[Fe(H_(2)O)_(5)NO]SO_(4).`
Discussion
60.

Assertion `: is called cyclohexane nitrile. Reason`:` It contains six carbone atoms in the ring and `-CN` as the functional group.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.C. If the assertion is true but reason is false.D. If assertion is false but reason is true.

Answer» Correct Answer - d
Discussion
61.

Assertion `:` The correct `IUPAC` name for the compound is `(1-`methylethyl`)` cyclopentane. Reason`:` It is named as a derivative of cyclopentane because the number of carbon atoms in the ring is more than in the side chain.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.C. If the assertion is true but reason is false.D. If assertion is false but reason is true.

Answer» Correct Answer - a
Discussion
62.

Assertion `:` The `IUPAC` name of `CH_(3)CH=CH-C CH` is pent`-2-`ene`-4-`yne and not pent`-3-`en`-1-`yne. Reason `:` While deciding the locants for double bond and triple bonds, lowest locant rule for multiple bonds is followed.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.C. If the assertion is true but reason is false.D. If assertion is false but reason is true.

Answer» Correct Answer - d
Discussion
63.

Assertion `:` The `IUPAC` name for the compound `C_(6)H_(5)COOCH_(2)CH_(2)COOH` is `3-`benzoyloxypropanoic acid. Reason `: C_(6)H_(5)CH_(2)O` is called benzoyloxy group.A. If both the assertion and reason are true and reason is the correct explanation of the assertion .B. If both the assertion and reason are true bu the reason is not the correct explanation of assertion.C. If the assertion is true but reason is false.D. If assertion is false but reason is true.

Answer» Correct Answer - c
Discussion
64.

Assertion `(A)` : The `IUPAC` name of the citric acid is 2-hydroxy-propane-1,2,3-tricarboxylic acid Reason `(R )`: When an unbranched `C` atom directly linked to more than two like-functional groups, then it is named as a dervative of the parent alkane which does not include the `C` of the functional groups. A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.C. If the assertion is true but reason is false.D. If assertion is false but reason is true.

Answer» Correct Answer - a
Discussion