633 + Interview Questions in ORGANIC-CHEMISTRY IN GENERAL AWARENESS Page 11 InterviewSolution

501.	The order of stability of free radical isA. `TertiarygtAllylgtBenzyl`B. `AllylgtBenzylgtTertiary`C. `BenzylgtAllylgtTertiary`D. `TertiarygtBenzylgtAllyl.`
Answer» Correct Answer - C Refer Comprehensive Review.

Discussion

502.	Most stable radical isA. B. C. `CH_(2)=CHoverset(cdot)CH_(2)`D. `CH_(2)=overset(cdot)CH.`
Answer» Correct Answer - C `(C)CH_(2)=CH-CH_(2)` Allyl free radical is highly stable due to hyperconjugation.

Discussion

503.	Which of the following compound will form free radical very readily ?A. EthaneB. EthanolC. Ethanoic acidD. Ethyl chloride.
Answer» Correct Answer - A Homolytic cleavage, especially between two similar atoms or atoms with almost equal electronegativities results in the formation of free radicals. Ethane is a non-polar covalent molecule and the bonds in it can break only by homolysis giving rise to free radicals. `CH_(3)CH_(3)rarr2CH_(3)^(cdot)` D. Ethyl Chloride

Discussion

504.	The most stable free radical among the following isA. `C_(6)H_(5)CH_(2)overset(cdot)CH_(2)`B. `C_(6)H_(5)overset(cdot)CHCH_(3)`C. `CH_(3)overset(cdot)CH_(2)`D. `CH_(3)overset(cdot)CHCH_(3)`
Answer» Correct Answer - B `C_(6)H_(5)overset(cdot)CHCH_(3)` is stabilised by the resonance due to phenyl group and hyperconjugative effect of the methyl group.

Discussion

505.	The central C atom of an alkyl free radical possessesA. 6 electronsB. 8 electronsC. 7 electronsD. None of the above
Answer» Correct Answer - C The central carbon atom of an alkyl free radical . possesses 7 electrons `(R_(2)overset(cdot)C)`.

Discussion

506.	CARBENES-SINGLET CARBENEA. `sp^(2)`B. `sp`C. `sp^(3)`D. None of these
Answer» Correct Answer - A Refer Comprehensive Review.

Discussion

507.	The IUPAC name of the spiro compound, isA. 2-Methylspiro(5. 4] deca-1, 6-dieneB. 2-Methylspiro(4. 5]deca-1, 6-dieneC. 8-Methylspiro (4. 5]deca-1, 7-dieneD. 3-Methylspiro (5. 4]deca-3, 7-diene.
Answer» Correct Answer - B Factual questions.

Discussion

508.	The IUPAC name of the alkane A. 2, 2, 6, 6, 7-Pentamethyloctane-3, 5-diolB. 2, 3, 3, 7, 7-Pentamethyloctane-4, 6-diolC. 5-tert-buty 1-2-isopropy-2-methylpentane -3, 5-diolD. 2-isopropyl-2,6,6-trimethylheptane-3, 5- diol.
Answer» Correct Answer - A Factual questions.

Discussion

509.	Write the IUPAC names of the following :
Answer» (i) 5-Methylhexa-1, 4-diene (ii) But-1-en-3-yne (iii) 6-Bromoheptanal.

Discussion

510.	Write the structures of the following compounds : (i) But-2-enoic acid (ii) But-1-en-3-yne (iii) 3, 4, 4-Trimethylhex-1-yne
Answer» (i) `CH_(3)-CH=CH-COOH` (ii) `CH equiv C-CH=CH_(2)` (iii) `CH_(3)-CH_(2)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(C)-underset(CH_(3))underset(\|)(CH)-C equiv CH`

Discussion

511.	3-Phenyl-prop-2-enoic acid is IUPAC name ofA. Mendallic acidB. Pivallic acidC. Succinic acidD. Cinnamic acid.
Answer» Correct Answer - D Factual questions.

Discussion

512.	Tautomerism will be exhibited byA. `(CH_(3))_(2)NH`B. `(CH_(3))_(3)CNO`C. `R_(3)CNO_(2)`D. `RCH_(2)NO_(2)`
Answer» Correct Answer - D `(a,b,c)` do not contain acidic `alpha`-hydrogen.

Discussion

513.	Keto-enol tautomerism is not observed in:A. `C_(6)H_(5)-overset(O)overset(\|\|)(C)-H`B. `C_(6)H_(5)-overset(O)overset(\|\|)(C)-CH_(3)`C. `C_(6)H_(5)-overset(O)overset(\|\|)(C)-CH(CH_(3))_(2)`D. `C_(6)H_(5)-overset(O)overset(\|\|)(C)-CH_(2)-overset(O)overset(\|\|)(C)-CH_(3)`
Answer» Correct Answer - A Due to absent of `alpha`-hydrogen with respect to `C=O`.

Discussion

514.	Keto-enol tautomerism is observed inA. `C_(6)H_(5)-overset(O)overset(\|\|)(C)-H`B. `C_(6)H_(5)-overset(O)overset(\|\|)(C)-CH_(3)`C. `C_(6)H_(5)-overset(O)overset(\|\|)(C)-C_(6)H_(5)`D. `C_(6)H_(5)-overset(O)overset(\|\|)(C)-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)(C)-C_(6)H_(5)`
Answer» Correct Answer - B For a compound to exhibit keto-enol isomerism, presence of `alpha`-hydrogen is necessary. This is satisfied only by acetophenone.

Discussion

515.	Among the following compounds, one that will not shown keto-enol tautomerism isA. B. C. D.
Answer» Correct Answer - B `sp^(2)` hybridisation is very less stable at bridgehead carbon of a bicyclic compound.

Discussion

516.	Expand each of the following condensed formulae into their complete structural formulae (a) `CH_(3)CH_(2)COCH_(2)CH_(3)` (b) `CH_(3)CH = CH(CH_(2))_(3)CH_(3)`
Answer» (a) `H-underset(H)underset(\|)overset(H)overset(\|)(C)-underset(H)underset(\|)overset(H)overset(\|)(C)-overset(O)overset(\|\|)(C)-underset(H)underset(\|)overset(H)overset(\|)(C)-underset(H)underset(\|)overset(H)overset(\|)(C)-H` (b) `H-underset(H)underset(\|)overset(H)overset(\|)(C)-overset(H)overset(\|)(C)=overset(H)overset(\|)(C)-underset(H)underset(\|)overset(H)overset(\|)(C)-underset(H)underset(\|)overset(H)overset(\|)(C)-underset(H)underset(\|)overset(H)overset(\|)(C)-underset(H)underset(\|)overset(H)overset(\|)(C)-H`

Discussion

517.	Arrange the following carbocations in increasing order of stability and mention basis of the order suggested (i) `overset(o+)(C)H_(3)" "`(ii) `CH_(3)overset(o+)(C)H_(2)" "`(iii) `CH_(3)overset(o+)(C)HCH_(3)" "`(iv) `CH_(3)-underset(CH_(3))underset(\|)overset(o+)(C)-CH_(3)`
Answer» Number of `alpha-`hydrogen =No. of Hyperconjugation structure and higher its stability so `CH_(3)^(o+)ltCH_(3)CH_(2)^(o+)-underset(CH_(2))underset(\|)overset(o+)(CH)ltCH_(3)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(C^(o+))`

Discussion

518.	Arrange the following carbocations in order of increasing stability I. `(CH_(3))_(3)C CH_(2)^(+)` II. `(CH_(3))_(3)C^(+)` III. `CH_(3)CH_(2)CH_(2)^(+)` IV. `CH_(3)-overset(+)(C)H - CH_(3)`A. `IV lt III lt II lt I`B. `III lt IV lt I lt II`C. `I lt III lt IV lt II`D. `II lt IV lt III lt I`
Answer» Correct Answer - C `(CH_(3))_(3)overset(+)(C)` (II) is stabilized by nine, `CH_(3)overset(+)(C)HCH_(3)(IV)` is stabilized by six, `CH_(3)CH_(2)CH_(2)^(+)` (III) is stabilized by two while `(CH_(3))_(3)C CH_(2)^(+)` (I) has no hyperconjugation structure. Therefore, II is the most stable, followed IV, then by III while I is the least stable. Thus, option (c) is correct.

Discussion

519.	What si the correct order of decreasing stability of the following carbocations. `underset(I.)(CH_(3)-overset(o+)(C)H-CH_(3))" "underset(II.)(CH_(3)-overset(o+)(C)H-OCH_(3))` `underset(III.)(CH_(3)-overset(o+)(C)H-CH_(2)-OCH_(3))`A. `II gt I gt III`B. `II gt III gt I`C. `III gt I gt II`D. `I gt II gt III`
Answer» Correct Answer - A Is the correct order of decreasing stabilities of secondary carbocations.

Discussion

520.	0.2 of an organic compound containing phosphorus gave 1.877 g of ammonium phosphomolybdate by usual analysis. Calculate the percentage of phosphorus in the organic compound.
Answer» `underset(1877g)((NH_(3))_(3)PO_(4). 12MoO_(3)) -= underset(31g)(P)` `:. % P = (31)/(1877) xx (1.877)/(0.2) = 15.5`

Discussion

521.	Show the polarisation of carbon-magnesium bond in the following structure. `CH_(3) - CH_(2) - CH_(2) - CH_(2) - Mg - X`
Answer» `CH_(3)-CH_(2)-CH_(2)-overset(delta-)(CH_(2))-overset(delta +)(Mg)-X` (C is more electronegative than `Mg`).

Discussion

522.	Give its IUPAC name
Answer» 1,1,2,2,3,3 -Hexamethylcyclopropane.

Discussion

523.	Write its IUPAC name `CH_(3)-underset(CH_(3))underset(\|)(CH)-CH_(2)-underset(CH_(2))underset(\|)overset(CH_(3))overset(\|)(C)-CH_(3)`
Answer» `overset(5)CH_(2)-underset(CH_(3))underset(\|)overset(4)(CH)-overset(3)CH_(2)-underset(CH_(3))underset(\|)overset(CH_(2))overset(2\|)(C)-overset(1)CH_(2)`

Discussion

524.	The order of decreasing stability of the following carbanions is (i) `(CH_(3))_(3)C^(-)` (ii) `(CH_(3))_(2)CH^(-)` (iii) `CH_(3)CH_(2)^(-)` (iv) `C_(6)H_(5)CH_(2)^(-)`A. (i)gt(ii)gt(iii)gt(iv)B. (iv)gt(iii)gt(ii)gt(i)C. (iv)gt(i)gt(ii)gt(iii)D. (iii)gt(ii)gt(i)gt(Iv)
Answer» Correct Answer - B Stability of carbanions decreases with increase in `+I` effect. +I effect is maximum in `(CH_(3))_(3)C^(-)`, followed by `(CH_(3))_(2)CH^(-) and CH_(3)CH_(2)^(-)`. In `C_(6)H_(5)CH_(2)^(-)`, resonance effect increases the stability. Hence, the order of stability is (iv)gt(iii)gt(ii)gt(i)

Discussion

525.	The order of decreasing stability of the carbanions : `(CH_(3))_(3)C^(-)(I),(CH_(3))_(2)CH^(-)(II), CH_(3)CH_(2)^(-)(III), C_(6)H_(5)CH_(2)^(-)(IV)` isA. `IgtIIgtIIIgtIV`B. `IVgtIIIgtIIgtI`C. `IVgtIgtIIgtIII`D. `IgtIIgtIVgtIII.`
Answer» Correct Answer - B `A" "3^(@)` carbanion (I) is least stable. Carbanion (IV) is most stable due to resonance. Therefore correct order is `IV gt III gt II gt I`.

Discussion

526.	Arrange the following carbanions in decreasing order of stability: `underset((I))(.^(Theta)(CH_(2))-Cl)` , `underset((II))(.^(Theta)(CH_(2))-CN)`, `underset((III))(.^(Theta)(CH_(2))-NO_(2))`, `underset((IV))(.^(Theta)CH_(2)-CH_(3))`A. `IIIgtIIgtIVgtI`B. `IIIgtIIgtIgtIV`C. `IIIgtIgtIIgtIV`D. `IIgtIIIgtIgtIV`
Answer» Correct Answer - B Due to `-M` and `-I` of group.

Discussion

527.	Arrange the following : (i) `-NO_(2), -COOH, -F, -CN, -I`, in decreasing order of -I effect. (ii) `CH_(3)^(-), D-, (CH_(3))_(3)C-, (CH_(3))_(2)CH-, CH_(3)CH_(2^(-))`, in increasing order of +I effect.
Answer» (i) `-NO_(2) gt -CN gt -COOH gt -F gt -I` (ii) `D - lt CH_(3) - lt CH_(3)CH_(2^(-)) lt (CH_(3))_(2)CH- lt -C(CH_(3))_(3)`.

Discussion

528.	Arrange the following : (i) `C_(6)H_(5)overset()(C)HCH_(3), C_(6)Hoverset()(C)HCH = CH_(2), C_(6)H_(5)CH_(2)overset()(C)H_(2), C_(6)H_(5)overset()(C)(CH_(3))_(2)` in order of increasing stability. (ii) `CH_(3)CH_(2)^(+), C_(6)H_(5)CH_(2)^(+), (CH_(3))_(3)C^(+), CH_(2) =CHCH_(2)^(+)` in order of decreasing stability. (iii) `HC -= C^(-), CH_(2) = CH^(-), CH_(3)CH_(2)^(-), CH_(3)^(-), (CH_(3))_(2)CH^(-), C_(6)H_(5)CH_(2)^(-)`in order of increasing stability.
Answer» `(i) C_(6)H_(5)CH_(2)overset()(C)H_(2) lt C_(6)H_(5)overset()(C)HCH_(3) lt C_(6)H_(5)overset()(C)(CH_(3))_(2) lt C_(6)H_(5)overset()(C)H - CH = CH_(2)`. (ii) `(CH_(3))_(3)C^(+) gt C_(6)H_(5)CH_(2)^(+) gt CH_(2) = CHCH_(2)^(+) gt CH_(3)CH_(2)^(+)`. (iii) `(CH_(3))_(2)CH^(-) lt CH_(3)CH_(2)^(-) lt CH_(3)^(-) lt CH_(2) = CH^(-) lt C_(6)H_(5)CH_(2)^(-) lt HC -= C^(-)`.

Discussion

529.	Which of the following is the rearranged more stable carbocation of the given species? `CH_(3)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(C )-overset(o+)(CH)-CH_(3) rarr`A. `CH_(3)-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)(C)-underset(o+)(C)H-CH_(3)`B. `CH_(3)-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)(C)-CH_(2)-overset(o+)(C)H_(2)`C. `CH_(3)-overset(CH_(3))overset(\|)underset(o+)(C)-overset(CH_(3))overset(\|)(CH)-CH_(3)`D. `CH_(3)-overset(CH_(3))overset(\|)(CH)-underset(CH_(3))underset(\|)(CH)-overset(o+)(C)H_(2)`
Answer» Correct Answer - C `CH_(3)-overset(CH_(3))overset(\|)underset(O+)underset(\|)C-overset(CH_(3))overset(\|)CH-CH_(3) 3^(@)` carbocation is more stable

Discussion

530.	Assertion : A mixture of o-nitrophenol and p-nitrophenol can be separated by steam distillation. Reason : p-Nitrophenol is steam volatile while o-nitrophenol is not steam volatile.A. If both assertion and Reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is falseD. If both assertion and reason are false
Answer» Correct Answer - C Correct reason. Due to chelation, o-nitrophenol is steam volatile while p-nitrophenol is not steam volatile.

Discussion

531.	The carbocation `CH_(3)overset(+)(C)HCH_(3)` is less stable thanA. `CH_(3)CH_(2)overset(+)(C)H_(2)`B. `overset(+)(C)H_(2)`C. `(CH_(3))_(3)overset(+)(C)`D. `CH_(3)overset(+)(C)H_(2)`
Answer» Correct Answer - C `(CH_(3))_(3)C^(+)` is more stable than `CH_(3)overset(+)(C)HCH_(3)`. Rest all are primary carbocations hence less stable.

Discussion

532.	In the organic compound `CH_(2)= CH - CH_(2) - CH_(2) - C -= CH`, the pair of hybridised orbitals involved in the formation of `C_(2)-C_(3)` bond is (a) `sp - sp^(2)` (b) `sp - sp^(3)` (c) `sp^(2) - sp^(3)` (d) `sp^(3) - sp^(3)`
Answer» When both double bonds are present at equivalent positions, double bond is given preference while numbering the carbon chain. Thus, `underset(sp^(2))overset(1)(C)H_(2) = underset(sp^(2))overset(2)(C)H - underset(sp^(3))overset(3)(C)H_(2)-underset(sp^(3))overset(4)(C)H_(2) - underset(sp)overset(5)(C) -= underset(sp)overset(6)(C)H` `:. C_(2) - C_(3)` bond is formed by overlap of `sp^(2) - sp^(3)` orbitals. Thus, option (c) is correct.

Discussion

533.	Which of the following carbocation is most stable ? (a) `(CH_(3))_(3)C overset(+)(C)H_(2)` (b) `(CH_(3))_(3)overset(+)(C)` (c) `CH_(3)CH_(2)overset(+)(C)H_(2)` (d) `CH_(3)overset(+)(C)HCH_(2)CH_(3)`
Answer» The order of stability of carbocation is : `3^(@) gt 2^(@)gt 1^(@)` (a) `underset(1^(@) " Carbocation")((CH_(3))_(3)C - overset(+)(C)H_(2))` (b) `underset(3^(@) "Carbocation")((CH_(3))_(3)overset(+)(C))` (c) `underset(1^(@) "Carbocation")(CH_(3)CH_(2)overset(+)(C)H_(2))` (d) `underset(2^(@) "Carbocation")(CH_(3)overset(+)(C)HCH_(2)CH_(3))` Since `3^(@)` carbocations are the most stable, therefore, option (b) is correct.

Discussion

534.	Assertion : Oils are purified by steam distillation. Reason : The compounds which decompose at their boiling points can be purified by steam distillation.A. If both assertion and Reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is falseD. If both assertion and reason are false
Answer» Correct Answer - D Correct assertion. Only essential oils are purified by steam distillation. Correct reason. Compounds which are volatile in steam and insoluble in water can be purified by steam distillation.

Discussion

535.	The effect that makes 2, 3-dimethyl-2-butene more stable than 2-butene isA. resonanceB. hyperconjugationC. electromeric effectD. inductive effect
Answer» Correct Answer - B

Discussion

536.	Statement-1: `CH_(3)-O-CH_(2)` is more stable than `O=overset(O)overset(\|)(N)-CH_(2)` Statement-2: is antiaromatic molecule Statement-3: Phenoxide is more stable than ethoxideA. F F TB. T T FC. F T FD. T F T
Answer» Correct Answer - D

Discussion

537.	The IUPAC name of the compound having formula `H_(3)C-underset(CH_(3))underset(\|)overset(CH_(2)CH_(3))overset(\|)(C)-CH=CH_(2)` isA. 3,3,3-trimethylprop-1-eneB. 1,1,1-trimethylprop-2-eneC. 3,3-dimethylpent-1-eneD. 2,2-dimethylbut-3-ene.
Answer» Correct Answer - C `underset("3,3-Dimethylpent-1-ene")(H_(3)overset(5)(C)-overset(4)(C)H_(2)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)( .^(3)C)-overset(2)(C)H=overset(1)(C)H_(2))`

Discussion

538.	The IUPAC name of the compound having the formula `CH -= C - CH = CH_(2)` isA. 1-butyne-3-eneB. but-1-yne-3-eneC. 1-butene-3-yneD. 3-butene-1-yne
Answer» Correct Answer - C `Hoverset(4)(C) -= overset(3)(C)-overset(2)(C)H=overset(1)(C)H_(2)` 1-Butene-3-yne (`because` double bond is given preference)

Discussion

539.	The correct IUPAC name of compound with molecular formula `(CH_(3))_(3)C-CH_(3)` isA. PentaneB. 1, 1, 1-TrimethylethaneC. 2,2-DimethylpropaneD. Neopentane.
Answer» Correct Answer - C `underset("2,2-Dimethylpropane")underset()(overset(1)CH_(3)-overset(CH_(3))overset("2 \| ")underset(CH_(3))underset(" \|")C-overset(3)CH_(3))`

Discussion

540.	The compound with molecular formula, `C_(6)H_(14)` has two tertiary carbons. Its IUPAC name isA. n-hexaneB. 2-methylpentaneC. 2, 3-dimethylbutaneD. 2, 3-dimethylpentane
Answer» Correct Answer - C 2, 3-Dimethylbutane as shown in Ans 15 has two `3^(@)` carbon atoms.

Discussion

541.	The compound `CH_(3)-overset(OH)overset(\|)CH-CH_(3)` can be named asA. Propan-2-01B. DimethylcarbinolC. Isopropyl alcoholD. 1-Methylethanol.
Answer» Correct Answer - A::B::C In carbinol system of nomenclature of alcohols, `CH_(3)OH` (methyl alcohol) is named as carbinol. All other alcohols are considered as alkyl derivatives of carbinol. The name of the alcohol is written as one word.

Discussion

542.	The correct IUPAC name of the compound with molecular formula `(CH_(3))_(3)C - CH_(3)` is :A. PentaneB. 1, 1, 1-TrimethylthaneC. 2, 2-DimethylpropaneD. Neopentane
Answer» Correct Answer - C `{:(" "CH_(3)),(" \|"),(CH_(3)-C-CH_(3)),(" \|"),(" "CH_(3)):}` 2, 2-Dimethylpropane

Discussion

543.	The IUPAC name of `H-overset(O)overset(\|)C-CH=O` isA. FormylmethanalB. 1,2-EthanedioneC. Formyl methanoateD. Ethane-1,2-dial
Answer» Correct Answer - D `underset("Ethane-1,2-dial")underset()(H-overset(O)overset(\|\|)C-overset(O)overset(\|\|)C-H)`

Discussion

544.	The compound may be named as `:-`A. 2-Ethyl-2-metholoxiraneB. 1,2-OxapentaneC. 1,2-Epoxy-2-methylbutaneD. 2-Methyl-1, 2-butaoxide.
Answer» Correct Answer - A::C The given compound is a cyclic ether. Here (A) ts a common name and (C) is the IUPAC name.

Discussion

545.	Constitutional isomerism is possible in alkanes only if the number carbon atoms present isA. `5` or moreB. `4` or moreC. an even numberD. an odd number
Answer» Correct Answer - B The lowest number of carbon required in a hydrocarbon (alkane) to show constitutional isomerism is `4`. `CH_(3)-CH_(2)underset("Butane")(-)CH_(2)-CH_(3), CH_(3)-overset(CH_(3))overset(\|)(CH)-CH_(3)`

Discussion

546.	The correct IUPAC name(s) of `H-overset(O)overset(\|\|)C-CH_(2)-CH_(2)-overset(O)overset(\|\|)C-CH_(2)-COOH` is (are)A. 3,6-Dioxohexanoic acidB. 5-Formyl-3-oxohexanoic acidC. 6-Formyl-3-oxohexanoic acidD. 5-Formyl-3-oxopentanoic acid
Answer» Correct Answer - A::D See Comprehensive review.

Discussion

547.	The compound is known by which of the following namesA. Bicyclo [2,2,2] octaneB. Bicyclo [2,2,1] octaneC. Bicyclo [1,2,1] octaneD. Bicyclo [1,1,1] octane.
Answer» Correct Answer - A Factual question.

Discussion

548.	The IUPAC name of: `CH_(3) - underset(Cl)underset(\|)(C) = underset(CH_(3))underset(\|)(C)- - underset(C_(2)H_(5))underset(\|)(CH) - CH_(2) C -= CH` isA. 6-Chloro-4-ethyl-5-methylhept-5-en-1-yneB. 6-Chloro-4-ethyl-5-methylhept-1-yn-5-eneC. 2-Chloro-4-ethyl-3-methylhept-2-ene-6-yneD. 2-Chloro-4-ethyl-3-methylhept-6-yn-2-ene
Answer» Correct Answer - A `{:(overset(7)(C)H_(3)-overset(6)(C)=overset(5)(C)-overset(4)(C)H-overset(3)(C)H_(2)-overset(2)(C) equiv overset(1)(C)H),(" \|"" \|"" \|"),(" "Cl" "CH_(3)""C_(2)H_(5)):}` 6-chloro-4-ethyl-5-methylhept-5-en-1-yne

Discussion

549.	The IUPAC name of the formula `CH_(3)-overset(CH_(3))overset(\|)C=overset(H)overset(\|)C-COOH` isA. 2-Methylbut-2-enoic acidB. 3-Methylbut-3-enoic acidC. 3-Methylbut-2-enoic acidD. 2-Methylbut-3-enoic acid.
Answer» Correct Answer - C `underset("3-Methyl-2-enoic acid")underset()(overset(4)CH_(3)-overset(CH_(3))overset(3\|)C=overset(H)overset(\|2)C-overset(1)COOH)`

Discussion

550.	Which of the following shows functional isomerism?A. `CH_(3)CH_(2)Cl` and `CH_(3)CH_(2)Br`B. `CH_(3)CH_(2)Br` and `CH_(2)BrCH_(2)Br`C. `C_(2)H_(5)OC_(2)H_(5)` and `CH_(3)OC_(3)H_(7)`D. `CH_(3)CH_(2)CHO` and `CH_(3)COCH_(3)`
Answer» Correct Answer - D Aldehyde and Ketone are functional isomers.

Discussion

Explore topic-wise InterviewSolutions in .

The order of stability of free radical isA. `TertiarygtAllylgtBenzyl`B. `AllylgtBenzylgtTertiary`C. `BenzylgtAllylgtTertiary`D. `TertiarygtBenzylgtAllyl.`

Most stable radical isA. B. C. `CH_(2)=CHoverset(cdot)CH_(2)`D. `CH_(2)=overset(cdot)CH.`

Which of the following compound will form free radical very readily ?A. EthaneB. EthanolC. Ethanoic acidD. Ethyl chloride.

The most stable free radical among the following isA. `C_(6)H_(5)CH_(2)overset(cdot)CH_(2)`B. `C_(6)H_(5)overset(cdot)CHCH_(3)`C. `CH_(3)overset(cdot)CH_(2)`D. `CH_(3)overset(cdot)CHCH_(3)`

The central C atom of an alkyl free radical possessesA. 6 electronsB. 8 electronsC. 7 electronsD. None of the above

CARBENES-SINGLET CARBENEA. `sp^(2)`B. `sp`C. `sp^(3)`D. None of these

The IUPAC name of the spiro compound, isA. 2-Methylspiro(5. 4] deca-1, 6-dieneB. 2-Methylspiro(4. 5]deca-1, 6-dieneC. 8-Methylspiro (4. 5]deca-1, 7-dieneD. 3-Methylspiro (5. 4]deca-3, 7-diene.

The IUPAC name of the alkane A. 2, 2, 6, 6, 7-Pentamethyloctane-3, 5-diolB. 2, 3, 3, 7, 7-Pentamethyloctane-4, 6-diolC. 5-tert-buty 1-2-isopropy-2-methylpentane -3, 5-diolD. 2-isopropyl-2,6,6-trimethylheptane-3, 5- diol.

Write the IUPAC names of the following :

Write the structures of the following compounds : (i) But-2-enoic acid (ii) But-1-en-3-yne (iii) 3, 4, 4-Trimethylhex-1-yne

3-Phenyl-prop-2-enoic acid is IUPAC name ofA. Mendallic acidB. Pivallic acidC. Succinic acidD. Cinnamic acid.

Tautomerism will be exhibited byA. `(CH_(3))_(2)NH`B. `(CH_(3))_(3)CNO`C. `R_(3)CNO_(2)`D. `RCH_(2)NO_(2)`

Keto-enol tautomerism is not observed in:A. `C_(6)H_(5)-overset(O)overset(||)(C)-H`B. `C_(6)H_(5)-overset(O)overset(||)(C)-CH_(3)`C. `C_(6)H_(5)-overset(O)overset(||)(C)-CH(CH_(3))_(2)`D. `C_(6)H_(5)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`

Keto-enol tautomerism is observed inA. `C_(6)H_(5)-overset(O)overset(||)(C)-H`B. `C_(6)H_(5)-overset(O)overset(||)(C)-CH_(3)`C. `C_(6)H_(5)-overset(O)overset(||)(C)-C_(6)H_(5)`D. `C_(6)H_(5)-overset(O)overset(||)(C)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-C_(6)H_(5)`

Among the following compounds, one that will not shown keto-enol tautomerism isA. B. C. D.

Expand each of the following condensed formulae into their complete structural formulae (a) `CH_(3)CH_(2)COCH_(2)CH_(3)` (b) `CH_(3)CH = CH(CH_(2))_(3)CH_(3)`

Arrange the following carbocations in increasing order of stability and mention basis of the order suggested (i) `overset(o+)(C)H_(3)" "`(ii) `CH_(3)overset(o+)(C)H_(2)" "`(iii) `CH_(3)overset(o+)(C)HCH_(3)" "`(iv) `CH_(3)-underset(CH_(3))underset(|)overset(o+)(C)-CH_(3)`

Arrange the following carbocations in order of increasing stability I. `(CH_(3))_(3)C CH_(2)^(+)` II. `(CH_(3))_(3)C^(+)` III. `CH_(3)CH_(2)CH_(2)^(+)` IV. `CH_(3)-overset(+)(C)H - CH_(3)`A. `IV lt III lt II lt I`B. `III lt IV lt I lt II`C. `I lt III lt IV lt II`D. `II lt IV lt III lt I`

0.2 of an organic compound containing phosphorus gave 1.877 g of ammonium phosphomolybdate by usual analysis. Calculate the percentage of phosphorus in the organic compound.

Show the polarisation of carbon-magnesium bond in the following structure. `CH_(3) - CH_(2) - CH_(2) - CH_(2) - Mg - X`

Give its IUPAC name

Write its IUPAC name `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-underset(CH_(2))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)`

The order of decreasing stability of the following carbanions is (i) `(CH_(3))_(3)C^(-)` (ii) `(CH_(3))_(2)CH^(-)` (iii) `CH_(3)CH_(2)^(-)` (iv) `C_(6)H_(5)CH_(2)^(-)`A. (i)gt(ii)gt(iii)gt(iv)B. (iv)gt(iii)gt(ii)gt(i)C. (iv)gt(i)gt(ii)gt(iii)D. (iii)gt(ii)gt(i)gt(Iv)

The order of decreasing stability of the carbanions : `(CH_(3))_(3)C^(-)(I),(CH_(3))_(2)CH^(-)(II), CH_(3)CH_(2)^(-)(III), C_(6)H_(5)CH_(2)^(-)(IV)` isA. `IgtIIgtIIIgtIV`B. `IVgtIIIgtIIgtI`C. `IVgtIgtIIgtIII`D. `IgtIIgtIVgtIII.`

Arrange the following : (i) `-NO_(2), -COOH, -F, -CN, -I`, in decreasing order of -I effect. (ii) `CH_(3)^(-), D-, (CH_(3))_(3)C-, (CH_(3))_(2)CH-, CH_(3)CH_(2^(-))`, in increasing order of +I effect.

The carbocation `CH_(3)overset(+)(C)HCH_(3)` is less stable thanA. `CH_(3)CH_(2)overset(+)(C)H_(2)`B. `overset(+)(C)H_(2)`C. `(CH_(3))_(3)overset(+)(C)`D. `CH_(3)overset(+)(C)H_(2)`

In the organic compound `CH_(2)= CH - CH_(2) - CH_(2) - C -= CH`, the pair of hybridised orbitals involved in the formation of `C_(2)-C_(3)` bond is (a) `sp - sp^(2)` (b) `sp - sp^(3)` (c) `sp^(2) - sp^(3)` (d) `sp^(3) - sp^(3)`

Which of the following carbocation is most stable ? (a) `(CH_(3))_(3)C overset(+)(C)H_(2)` (b) `(CH_(3))_(3)overset(+)(C)` (c) `CH_(3)CH_(2)overset(+)(C)H_(2)` (d) `CH_(3)overset(+)(C)HCH_(2)CH_(3)`

The effect that makes 2, 3-dimethyl-2-butene more stable than 2-butene isA. resonanceB. hyperconjugationC. electromeric effectD. inductive effect

Statement-1: `CH_(3)-O-CH_(2)` is more stable than `O=overset(O)overset(|)(N)-CH_(2)` Statement-2: is antiaromatic molecule Statement-3: Phenoxide is more stable than ethoxideA. F F TB. T T FC. F T FD. T F T

The IUPAC name of the compound having formula `H_(3)C-underset(CH_(3))underset(|)overset(CH_(2)CH_(3))overset(|)(C)-CH=CH_(2)` isA. 3,3,3-trimethylprop-1-eneB. 1,1,1-trimethylprop-2-eneC. 3,3-dimethylpent-1-eneD. 2,2-dimethylbut-3-ene.

The IUPAC name of the compound having the formula `CH -= C - CH = CH_(2)` isA. 1-butyne-3-eneB. but-1-yne-3-eneC. 1-butene-3-yneD. 3-butene-1-yne

The correct IUPAC name of compound with molecular formula `(CH_(3))_(3)C-CH_(3)` isA. PentaneB. 1, 1, 1-TrimethylethaneC. 2,2-DimethylpropaneD. Neopentane.

The compound with molecular formula, `C_(6)H_(14)` has two tertiary carbons. Its IUPAC name isA. n-hexaneB. 2-methylpentaneC. 2, 3-dimethylbutaneD. 2, 3-dimethylpentane

The compound `CH_(3)-overset(OH)overset(|)CH-CH_(3)` can be named asA. Propan-2-01B. DimethylcarbinolC. Isopropyl alcoholD. 1-Methylethanol.

The correct IUPAC name of the compound with molecular formula `(CH_(3))_(3)C - CH_(3)` is :A. PentaneB. 1, 1, 1-TrimethylthaneC. 2, 2-DimethylpropaneD. Neopentane

The IUPAC name of `H-overset(O)overset(|)C-CH=O` isA. FormylmethanalB. 1,2-EthanedioneC. Formyl methanoateD. Ethane-1,2-dial

The compound may be named as `:-`A. 2-Ethyl-2-metholoxiraneB. 1,2-OxapentaneC. 1,2-Epoxy-2-methylbutaneD. 2-Methyl-1, 2-butaoxide.

Constitutional isomerism is possible in alkanes only if the number carbon atoms present isA. `5` or moreB. `4` or moreC. an even numberD. an odd number

The correct IUPAC name(s) of `H-overset(O)overset(||)C-CH_(2)-CH_(2)-overset(O)overset(||)C-CH_(2)-COOH` is (are)A. 3,6-Dioxohexanoic acidB. 5-Formyl-3-oxohexanoic acidC. 6-Formyl-3-oxohexanoic acidD. 5-Formyl-3-oxopentanoic acid

The compound is known by which of the following namesA. Bicyclo [2,2,2] octaneB. Bicyclo [2,2,1] octaneC. Bicyclo [1,2,1] octaneD. Bicyclo [1,1,1] octane.

The IUPAC name of the formula `CH_(3)-overset(CH_(3))overset(|)C=overset(H)overset(|)C-COOH` isA. 2-Methylbut-2-enoic acidB. 3-Methylbut-3-enoic acidC. 3-Methylbut-2-enoic acidD. 2-Methylbut-3-enoic acid.

Which of the following shows functional isomerism?A. `CH_(3)CH_(2)Cl` and `CH_(3)CH_(2)Br`B. `CH_(3)CH_(2)Br` and `CH_(2)BrCH_(2)Br`C. `C_(2)H_(5)OC_(2)H_(5)` and `CH_(3)OC_(3)H_(7)`D. `CH_(3)CH_(2)CHO` and `CH_(3)COCH_(3)`