GATE XL discipline:life-sciences PYQs & Answers — Page 88

Questions 871–880 of 1235. Imported answers require independent review unless marked reviewed.

Topic practice 1235 questionsPage 88 of 124

The compound that provides a carboxylic acid, upon treatment with Br₂ / NaOH followed by acidification, is

Your answerChoose one option.

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The boiling point of halogens from F₂ to I₂ increases due to

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decrease in electron affinity

decrease in ionization potential

dipole-dipole interaction

induced dipole – induced dipole interaction

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According to VSEPR theory, the species that has the smallest F-X-F angle (where X = central atom) is

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BF₃

PF₃

BF₄⁻

IF₄⁻

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The total number of tautomers for the following molecule (including the structure provided below) is ____.

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The total number of stereoisomers possible for the following structure is ____

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For the reaction mechanism,

;

. For this step, assume

: rate constant for this step. The rate law is

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Match the type of reaction in Group-1 with the most appropriate description in Group-2.

Group 1	Group 2
P — Hydroboration-oxidation	1 — Electrophilic aromatic substitution
Q — Nucleophilic aromatic substitution	2 — Oxaphosphetane intermediate
R — Wittig reaction	3 — Meisenheimer complex
S — Friedel-Crafts reaction	4 — Anti-Markownikoff’s product