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question_answer1) Ethyne is a stronger acid than propyne. Explain.
question_answer2) Electromeric effect is a temporary effect. Assign reason.
question_answer3) Alcohols are weaker acids than water. Why?
question_answer4) Ethylamine is a stronger base than acetamide. Assign reason.
question_answer5) Higher alkyl substituted alkene is formed in greater proportion than the lower alkyl substituted alkene. Justify.
question_answer6) Benzyl carbocation is more stable than ethyl carbocation. Justify.
question_answer7) How will you separate a mixture of benzoic acid and naphthalene?
question_answer8) Give the IUPAC name of the saturated hydrocarbon having the following carbon skeleton. \[\begin{align} & C-C-C-C-C-C-C \\ & |||| \\ & C-C-CCCC \\ \end{align}\]
question_answer9) Give the IUPAC name for the amine. \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{N}}\,-\underset{\begin{smallmatrix} | \\ {{C}_{2}}{{H}_{5}} \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{2}}C{{H}_{3}}\]
question_answer10) Write resonance structures of the given compound.
question_answer11) (a) Write down resonating structure and tautomer of (b)\[C{{H}_{2}}=\overset{\Theta }{\mathop{C}}\,H\] is more basic than \[HC\equiv {{C}^{-}}\]. Explain why.
question_answer12) Which of the following pairs do not constitute resonance structures? (a) (b) (c) (d) \[C{{H}_{3}}CH=CHC{{H}_{3}}\,\,\,and\,\,C{{H}_{3}}C{{H}_{2}}CH=C{{H}_{2}}\]
question_answer13) Explain the following: (i) exists in keto form but exists in enol form. (ii) \[C{{H}_{2}}=C{{H}^{-}}\]is a better nucleophile than \[HC\equiv {{C}^{-}}\].
question_answer14) Classify the following transformations according to the reaction type. (a) \[{{H}_{3}}C-CH=CH-C{{H}_{3}}+B{{r}_{2}}\]\[\xrightarrow{\,}\,{{H}_{3}}C-CHBr-CHBr-C{{H}_{3}}\] (b) \[{{({{H}_{3}}C)}_{2}}C=C{{(C{{H}_{3}})}_{2}}+B{{r}_{2}}\xrightarrow{{}}{{({{H}_{3}}C)}_{2}}C=C(C{{H}_{3}})C{{H}_{2}}Br+HBr\] (c) \[{{H}_{2}}C=CH-C{{H}_{2}}C{{H}_{3}}\xrightarrow{{}}{{H}_{3}}C-CH=CH-C{{H}_{3}}\] (d) \[{{C}_{6}}{{H}_{5}}CHO+C{{H}_{3}}COC{{H}_{3}}\xrightarrow{{}}{{C}_{6}}{{H}_{5}}CH(OH)C{{H}_{2}}COC{{H}_{3}}\] (e) \[{{(C{{H}_{3}})}_{3}}CCl\,+H{{O}^{-}}\,\xrightarrow{\,}\,{{(C{{H}_{3}})}_{2}}C=C{{H}_{2}}\] (f) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ Ph \end{smallmatrix}}{\mathop{C}}\,=N-OH+{{H}_{3}}{{O}^{+}}\xrightarrow{\,}\,C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ NHPh \end{smallmatrix}}{\mathop{C}}\,=O\]
question_answer15) When do we use a fluted filter paper or hot water funnel for filtration?
question_answer16) How will you purify a liquid having non-volatile impurities?
question_answer17) Suggest a method to purify : (i) Camphor containing traces of common salt. (ii) Kerosene oil containing water. (iii) A liquid which decomposes at its boiling point.
question_answer18) A mixture contains two components A and B. The solubilities of A and B in water near their boiling point are 10 grams per 100 mL and 2 g per 100 mL respectively. How will you separate A and B from this mixture?
question_answer19) Suggest methods for the separation of the following mixtures. (i) A mixture of liquid A (b.p. 365 K) and liquid B (b.p. 356 K). (ii) A mixture of liquid C (b.p. 353 K) and liquid D (b.p. 413 K).
question_answer20) How will you purify essential oils?
question_answer21) How will you separate a mixture of o-nitrophenol and p-nitrophenol?
question_answer22) (a) Write the IUPAC name of (i) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\mathop{C}}\,=CHCOOC{{H}_{3}}\] (ii) (b) Out of and which will be eluted first in moderately polar solvent and why?
question_answer23) A liquid (1.0 g) has three components. Which technique will you employ to separate them?
question_answer24) The \[{{R}_{f}}\] value of A and B in a mixture determined by TLC in a solvent mixture are 0.65 and 0.42 respectively. If the mixture is separated by column chromatography using the same solvent mixture as a mobile phase, which of the two components, A or B, will elute first? Explain.
question_answer25) A mixture contains benzoic acid and nitrobenzene. How can this mixture be separated into its constituents by the technique of extraction using an appropriate chemical reagent?
question_answer26) Without using column chromatography, how will you separate a mixture of camphor and benzoic acid?
question_answer27) Name two compounds which do not contain halogen but give positive Beilstein test.
question_answer28) Will sodium cyanide give a positive Lassaigne's test for nitrogen?
question_answer29) How will you test the presence of nitrogen in hydrazine?
question_answer30) Lassaigne's test is not shown by diazonium salts. Why?
question_answer31) Sometimes a red colour is not produced in the Lassaigne's test even if both nitrogen and sulphur are present in the organic compound. Explain.
question_answer32) Why is a freshly prepared saturated solution of ferrous sulphate used in the Lassaigne's test for nitrogen?
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