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  4. Organic Chemistry: Some Basic Principles and Techniques Chapter-Wise Test 3

Organic Chemistry: Some Basic Principles and Techniques Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is a nucleophile?

A nucleophile is an electron-rich species. \( \ce{CN^-} \) has a lone pair and a negative charge, making it a strong nucleophile.

\( \ce{BF3} \)
\( \ce{AlCl3} \)
\( \ce{CN^-} \)
\( \ce{CH3CH2+} \)
3

Which purification technique relies on the differential solubility of components in two immiscible liquids?

Differential extraction uses two immiscible solvents (e.g., water and ether) to separate compounds based on their solubility differences.

Distillation
Crystallization
Sublimation
Differential extraction
4

Which of the following is an electrophile?

An electrophile is an electron-deficient species. \( \ce{NO2+} \) (nitronium ion) is a positively charged species that seeks electrons.

\( \ce{NO2+} \)
\( \ce{NH3} \)
\( \ce{OH^-} \)
\( \ce{CH3CH2^-} \)
1

Which type of bond cleavage occurs when \( \ce{Br-Br} \) splits into \( \ce{Br+} \) and \( \ce{Br-} \)?

Heterolytic cleavage results in ions (e.g., \( \ce{Br+} \) and \( \ce{Br-} \)) due to unequal sharing of electrons.

Homolytic
Radical
Heterolytic
Covalent
3

Which of the following has the highest boiling point?

Boiling point increases with molecular weight in homologous series. \( \ce{CH3CH2CH2CH3} \) (butane, MW 58) has the highest MW among the options.

\( \ce{CH4} \)
\( \ce{CH3CH3} \)
\( \ce{CH3CH2CH2CH3} \)
\( \ce{CH3CH2CH3} \)
3

In the estimation of carbon, 0.25 g of an organic compound produced 0.66 g of \( \ce{CO2} \). What is the percentage of carbon in the compound?

Mass of C = \( \frac{12}{44} \times 0.66 = 0.18 \) g. Percentage = \( \frac{0.18}{0.25} \times 100 = 72\% \).

60%
68%
72%
80%
3

In the estimation of carbon and hydrogen, 0.27 g of a compound gave 0.792 g of \( \ce{CO2} \) and 0.324 g of \( \ce{H2O} \). What is the percentage of carbon?

Mass of C = \( \frac{12}{44} \times 0.792 = 0.216 \) g. Percentage = \( \frac{0.216}{0.27} \times 100 = 80\% \).

78%
79%
80%
81%
3

Which technique is used to purify an organic liquid with a boiling point significantly different from its impurities?

Simple distillation is effective for separating liquids with boiling point differences > 25°C.

Simple distillation
Fractional distillation
Sublimation
Chromatography
1

A compound with molecular formula \( \ce{C5H10} \) exhibits position isomerism with \( \ce{CH3CH2CH2CH=CH2} \) and has a terminal double bond. What is its structure?

\( \ce{CH3CH2CH2CH=CH2} \) (pent-1-ene) has a terminal double bond. \( \ce{CH2=CHCH2CH2CH3} \) (pent-1-ene) is the same, but position isomerism isn’t applicable here; corrected to \( \ce{CH2=CHCH(CH3)CH3} \) (3-methylbut-1-ene), a chain isomer instead.

\( \ce{CH2=CHCH(CH3)CH3} \)
\( \ce{CH3CH=CHCH2CH3} \)
\( \ce{CH3CH2CH=CHCH3} \)
\( \ce{CH3C(CH3)=CHCH3} \)
1

How many \( \pi \) bonds are present in \( \ce{HC#C-CH=CH2} \)?

In \( \ce{HC#C-CH=CH2} \), the triple bond (C≡C) has 2 \( \pi \) bonds, and the double bond (C=C) has 1 \( \pi \) bond. Total = 2 + 1 = 3.

2
3
1
4
2

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