alkenes - intermediate

34. which of the following does not show the members of the same homologous series?
a $c_2h_2$, $c_3h_4$, $c_4h_6$
b $ch_4$, $c_2h_6$, $c_3h_8$
c $c_2h_4$, $c_3h_6$, $c_4h_8$
d $c_2h_5$, $c_3h_7$, $c_4h_9$

35. with which substance will propene react to form more than one organic product under appropriate conditions?
a hydrogen in the presence of nickel catalyst
b steam in high temperature, catalysed by phosphoric acid
c chlorine in the dark
d oxygen at room temperature

*36. sorbic acid is used as a food preservative to minimise the growth of fungi and moulds. the structure of sorbic acid is given below.

\\text{ch}_3-\text{ch}=\text{ch}-\text{ch}=\text{ch}-\text{cooh}\

the number of double bonds present in sorbic acid can be determined by reacting the compound with $500\text{ cm}^3$ of hydrogen in the presence of a nickel catalyst.

what is the volume of hydrogen remaining in the reaction vessel at room temperature and pressure when $0.01\text{ mole}$ of sorbic acid is reacted completely?
a $10\text{ cm}^3$
b $20\text{ cm}^3$
c $30\text{ cm}^3$
d $40\text{ cm}^3$

Question

alkenes - intermediate

34. which of the following does not show the members of the same homologous series?
a $c_2h_2$, $c_3h_4$, $c_4h_6$
b $ch_4$, $c_2h_6$, $c_3h_8$
c $c_2h_4$, $c_3h_6$, $c_4h_8$
d $c_2h_5$, $c_3h_7$, $c_4h_9$

35. with which substance will propene react to form more than one organic product under appropriate conditions?
a hydrogen in the presence of nickel catalyst
b steam in high temperature, catalysed by phosphoric acid
c chlorine in the dark
d oxygen at room temperature

*36. sorbic acid is used as a food preservative to minimise the growth of fungi and moulds. the structure of sorbic acid is given below.

\\text{ch}_3-\text{ch}=\text{ch}-\text{ch}=\text{ch}-\text{cooh}\

the number of double bonds present in sorbic acid can be determined by reacting the compound with $500\text{ cm}^3$ of hydrogen in the presence of a nickel catalyst.

what is the volume of hydrogen remaining in the reaction vessel at room temperature and pressure when $0.01\text{ mole}$ of sorbic acid is reacted completely?
a $10\text{ cm}^3$
b $20\text{ cm}^3$
c $30\text{ cm}^3$
d $40\text{ cm}^3$

Accepted Answer

{ "quality": "clear", "question_count": 3, "skills_matched": [ "step_cot", "multiple_choice_formatter", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "Homologous Series", "Alkene Reactions", "Catalytic Hydration" ], "new_concepts": [ "Stoichiometry of Hydrogenation", "Molar Volume of Gas" ], "current_concepts": [ "Homologous Series", "Alkene Reactions", "Catalytic Hydration", "Stoichiometry of Hydrogenation", "Molar Volume of Gas" ] } ## Analyze Question 34 \[ \begin{aligned} &\text{General formulas for homologous series:} \ &\text{Alkanes: } \text{C}_n\text{H}_{2n+2} \ &\text{Alkenes: } \text{C}_n\text{H}_{2n} \ &\text{Alcohols: } \text{C}_n\text{H}_{2n+1}\text{OH} \ &\text{Alkyl radicals: } \text{C}_n\text{H}_{2n+1} \ \ &\text{Option A: } \text{C}_2\text{H}_2, \text{C}_3\text{H}_4, \text{C}_4\text{H}_6 \implies \text{Alkynes } (\text{C}_n\text{H}_{2n-2}) \ &\text{Option B: } \text{CH}_4, \text{C}_2\text{H}_6, \text{C}_3\text{H}_8 \implies \text{Alkanes } (\text{C}_n\text{H}_{2n+2}) \ &\text{Option C: } \text{C}_2\text{H}_4, \text{C}_3\text{H}_6, \text{C}_4\text{H}_8 \implies \text{Alkenes } (\text{C}_n\text{H}_{2n}) \ &\text{Option D: } \text{C}_2\text{H}_5, \text{C}_3\text{H}_7, \text{C}_4\text{H}_9 \implies \text{Alkyl groups } (\text{C}_n\text{H}_{2n+1}) \ &\text{Wait, let's re-examine Option D in the image: } \text{C}_2\text{H}_5, \text{C}_3\text{H}_7, \text{C}_4\text{H}_{11} \ &\text{For } n=4\text{, the alkyl group is } \text{C}_4\text{H}_9\text{. } \text{C}_4\text{H}_{11} \text{ is not a valid alkyl group or member of this series.} \end{aligned} \] ## Analyze Question 35 $$ \begin{aligned} &\text{Propene } (\text{CH}_3\text{-CH=CH}_2) \text{ is an unsymmetrical alkene.} \ &\text{A: Reaction with } \text{H}_2/\text{Ni} \implies \text{propane (1 product).} \ &\text{B: Reaction with } \text{H}_2\text{O(g)}/\text{H}_3\text{PO}_4 \implies \text{propan-1-ol and propan-2-ol (2 products due to unsymmetrical addition).} \ &\text{C: Reaction with } \text{Cl}_2 \text{ in the dark} \implies \text{1,2-dichloropropane (1 product).} \ &\text{D: Reaction with } \text{O}_2 \text{ at room temperature} \implies \text{No reaction.} \end{aligned} $$ ## Analyze Question 36 $$ \begin{aligned} &\text{Sorbic acid structure contains two } \text{C=C} \text{ double bonds and one } \text{C=O} \text{ double bond (in carboxylic acid).} \ &\text{Only the two } \text{C=C} \text{ double bonds undergo addition reaction with } \text{H}_2 \text{ in the presence of Ni catalyst.} \ &\text{Mole ratio of sorbic acid to } \text{H}_2 \text{ reacted} = 1 : 2 \ &\text{Moles of } \text{H}_2 \text{ reacted} = 2 \times 0.01\text{ mol} = 0.02\text{ mol} \ &\text{Volume of } \text{H}_2 \text{ reacted at r.t.p.} = 0.02\text{ mol} \times 24000\text{ cm}^3/\text{mol} = 480\text{ cm}^3 \ &\text{Volume of } \text{H}_2 \text{ remaining} = 500\text{ cm}^3 - 480\text{ cm}^3 = 20\text{ cm}^3 \end{aligned} $$ ## Question 34 (A) $\text{C}_2\text{H}_2$, $\text{C}_3\text{H}_4$, $\text{C}_4\text{H}_6$

(B) $\text{CH}_4$, $\text{C}_2\text{H}_6$, $\text{C}_3\text{H}_8$

(C) $\text{C}_2\text{H}_4$, $\text{C}_3\text{H}_6$, $\text{C}_4\text{H}_8$

(D) $\text{C}_2\text{H}_5$, $\text{C}_3\text{H}_7$, $\text{C}_4\text{H}_{11}$ ## Question 35 (A) hydrogen in the presence of nickel catalyst

(B) steam in high temperature, catalysed by phosphoric acid

(C) chlorine in the dark

(D) oxygen at room temperature ## Question 36 (A) $10\text{ cm}^3$

(B) $20\text{ cm}^3$

(C) $30\text{ cm}^3$

(D) $40\text{ cm}^3$

{ "subject": "Natural Science", "question_type": "Multiple Choice", "knowledge_point": [ "Natural Science", "Chemistry", "Organic Chemistry" ] }

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Analyze Question 34

Analyze Question 35

Analyze Question 36

Answer:

Question 34

Question 35

Question 36