{"id":28118,"date":"2025-06-20T09:37:43","date_gmt":"2025-06-20T09:37:43","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=28118"},"modified":"2025-06-20T09:37:46","modified_gmt":"2025-06-20T09:37:46","slug":"answer-the-following-questions","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/answer-the-following-questions\/","title":{"rendered":"Answer the following questions."},"content":{"rendered":"\n<p>Answer the following questions. Arrange the following compounds in the increasing order of their boiling points: CH4, CH3CHO, CH3CH2OH, CH3COOH. Write simple chemical tests to distinguish between the following pair of compounds: Propanal and 2-propanone. Draw the structure of the following: p-Methylbenzaldehyde (ii) 4-Methylpent-3-en-2-one. Find out the IUPAC names and structural formula for two esters present in perfumes.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-light-green-cyan-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>1. Increasing Order of Boiling Points:<\/strong><\/p>\n\n\n\n<p>The compounds given are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CH\u2084 (Methane)<\/li>\n\n\n\n<li>CH\u2083CHO (Acetaldehyde)<\/li>\n\n\n\n<li>CH\u2083CH\u2082OH (Ethanol)<\/li>\n\n\n\n<li>CH\u2083COOH (Acetic acid)<\/li>\n<\/ul>\n\n\n\n<p><strong>Order:<\/strong><br>CH\u2084 &lt; CH\u2083CHO &lt; CH\u2083CH\u2082OH &lt; CH\u2083COOH<\/p>\n\n\n\n<p><strong>Explanation:<\/strong><br>Boiling point depends on molecular mass and intermolecular forces. CH\u2084 has only weak London dispersion forces. CH\u2083CHO has dipole-dipole interactions. CH\u2083CH\u2082OH shows hydrogen bonding, which is stronger. CH\u2083COOH forms dimers via hydrogen bonding, raising its boiling point further.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>2. Chemical Tests to Distinguish Propanal and 2-Propanone:<\/strong><\/p>\n\n\n\n<p><strong>Propanal (an aldehyde)<\/strong> and <strong>2-propanone (a ketone)<\/strong> can be distinguished by the following tests:<\/p>\n\n\n\n<p><strong>a) Tollen\u2019s Test:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Propanal gives a <strong>positive result<\/strong> (silver mirror forms).<\/li>\n\n\n\n<li>2-propanone gives a <strong>negative result<\/strong> (no reaction).<\/li>\n<\/ul>\n\n\n\n<p><strong>b) Fehling\u2019s Test:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Propanal reduces the blue Fehling\u2019s solution to red precipitate.<\/li>\n\n\n\n<li>2-propanone does not react.<\/li>\n<\/ul>\n\n\n\n<p>These tests work because aldehydes are easily oxidized, while ketones are not.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>3. Structure Drawing:<\/strong><\/p>\n\n\n\n<p><strong>i) p-Methylbenzaldehyde:<\/strong><br>This is benzaldehyde with a methyl group at the para position.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">markdownCopyEdit<code>        CHO\n         |\n  C6H4\u2014CH3 (methyl at para to CHO)\n<\/code><\/pre>\n\n\n\n<p><strong>ii) 4-Methylpent-3-en-2-one:<\/strong><br>Five-carbon chain, double bond between C-3 and C-4, ketone at C-2, methyl at C-4.<\/p>\n\n\n\n<p><strong>Structure:<\/strong><\/p>\n\n\n\n<p>CH\u2083\u2013CO\u2013CH=CH\u2013CH\u2083<br>(with a CH\u2083 branch at C-4)<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>4. IUPAC Names and Structures of Two Esters in Perfumes:<\/strong><\/p>\n\n\n\n<p><strong>a) Ethyl ethanoate (ethyl acetate):<\/strong><br>Structure: CH\u2083COOCH\u2082CH\u2083<br>IUPAC: Ethyl ethanoate<br>Smells fruity and is widely used in perfumes.<\/p>\n\n\n\n<p><strong>b) Methyl salicylate:<\/strong><br>Structure: C\u2086H\u2084(OH)COOCH\u2083<br>IUPAC: Methyl 2-hydroxybenzoate<br>Has a wintergreen scent and is also used in perfumes.<\/p>\n\n\n\n<p>These esters are chosen for their pleasant aromas and volatility.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner5-102.jpeg\" alt=\"\" class=\"wp-image-28119\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner5-102.jpeg 1024w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner5-102-300x300.jpeg 300w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner5-102-150x150.jpeg 150w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner5-102-768x768.jpeg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Answer the following questions. Arrange the following compounds in the increasing order of their boiling points: CH4, CH3CHO, CH3CH2OH, CH3COOH. Write simple chemical tests to distinguish between the following pair of compounds: Propanal and 2-propanone. Draw the structure of the following: p-Methylbenzaldehyde (ii) 4-Methylpent-3-en-2-one. Find out the IUPAC names and structural formula for two esters [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-28118","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28118","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=28118"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28118\/revisions"}],"predecessor-version":[{"id":28120,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28118\/revisions\/28120"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=28118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=28118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=28118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}