# Changing paragraph spacing in a specific part

I am working with the exercise and in some of my questions (when I have large equations), I would like to have a different paragraph spacing. Is there a way to do this? This is what I have:

\documentclass[14pt]{extarticle}
\usepackage[margin=1.in]{geometry}
\usepackage{amsmath, exercise, multicol}

\renewcommand{\baselinestretch}{1.25}

\begin{document}

\parskip=12pt

\begin{Exercise}[label=Ex1]
\Question {Here the spacing is normal}
\subQuestion {$x^2 + x$}
\subQuestion {$2x + a$}

\Question {Here I want more space between paragraphs}
\parskip=24pt # This has no effect
\Question {$\dfrac{x^2 - 2}{x^2 + x + 1}$}
\Question {$\dfrac{2x^2 + 2x + 1}{x^2 + x + 2}$

\end{Exercise}

\end{document}


\vspace{2in}